regarding Voiding there are so many legal issues which may come about, some will some wont, but off the top of my head...
* TV rights dispute - BT and Sky feel they are owed their pound of flesh & will probably fight for it
* If records are expundged (which is what is suggested) What happens when Spurs dock harry Kane for all the goal bonus's this season, never mind that what happens when West-ham remove every single players appearance bonus from their next paycheck
* What happens in 8 years time when Kane retires 4 Goals short of Shearers record
* Season Ticket holders - nothing stopping a class action from fans against a club, you sold us a ticket for a season - it didn't conclude I'm entitled to a full refund; you could see a scenario where West Ham fans collectively try to stick knives into their owners via this kind of mechanic
* Gambling - if all records are expunged; are all losing bets refunded from every game?
* Relegation / Promotion / European places through all the leagues
* Jan transfers - teams could argue they specifically signed a player in Jan to avoid relegation and should get that money back if the season can't be concluded eg: Reina at Villa
I could go on & yes, in a way, I'm playing Devil's advocate & I appreciate someone will just say "Force Majeure" get over it, but that wont stop some of these issues ending up in a court of law. To me it brings as many issues a Pool of 69 players of whom the majority wont have a contract dispute.
Re Belgium; it wasn't simply voided - there was an agreed awarding of title, European spots have been allocated (subject to UEFA approving) and two extra spots next season to accomodate the likely promoted clubs, result in at least 6 extra games next season to best of my knowledge
Ok I'll try to answer each point on it's merits. I will cover most by saying though, they are not legal issues. They may be moral issues, but that is very different to legal cases that an be brought. I could bring a whole plethora of extra moral issues, but have stuck to legal difficulties, which with respect you haven't resolved. But anyway
1) Yes undoubtedly this is an issue. I have always acknowledged this. In all honesty though this is a legal issue whatever happens. If the PL plays outside of the allotted contracted time, there are legal issues. If the PL puts some games on streams behind closed doors, there are legal issues. No Fans, legal issues. Under every scenario there are legal issues. It's not an argument for extending, because there are legal issues in every scenario.
Broadly speaking I think a court will take the position you pay for the games viewed, you've had 3/4ers so you pay for 3/4. The concern I would have, is if we cancel next season, trying to finish a quarter of this season, we lose an entire seasons money. That will take a very challenging situation and make it a terminal one.
2) I mean I don't think this is a legal issue at all. It's a worthwhile question, but courts are not going to waste time intervening in who has how many goals. Harry Kane is not going to be able to display loss of earnings because he's 4 goals short of a record. We have this issue with games in WW1 & 2 and I am unaware of any legal challenges that have been made.
3) Bonuses and salaries will need to be agreed between clubs and their players. There's nothing to say that clubs will need to start claiming back goal bonus money. If a club wants to do it fine, they can live with the consequences. They don't have to though.Thats not an issue of voiding, it's an issue of how clubs conduct themselves. You can again have equivalent issues if you extend beyond the seasons out. In truth you probably have far bigger issues.
4) Yes fans could take action. Fans could also take action if you play games outside the allotted period. They could take action if games are behind closed doors. Or if they are arrested trying to get to a game they have paid for a ticket at. I accept it's an issue, it's an issue in any scenario, so it's not a unique problem for voiding.
5)I imagine no bets will be honoured. Gambling company's have astute small print that gets them out of all sorts of things. Again, I will keep repeating myself, but you will have similar problems (and probably greater problems) if they void results outside of the regular season and teams go on to win. Losing bets will not be refunded, it was a 90 minute game, possession is 9 tenths of the law. Gambling's default position will be all bets are void and such an approach from the league will at least sync with this.
6) I have no idea of how the legal challenge for this would work. An event out of the control of the FA/PL rendered the league unplayable. They could do know more. The opposite to what you are saying is true of course. If a side signs a player, is unable to register them and then goes down, they will sue. In the void scenario, nobody would go down, so I see no reason why Aston Villa would sue. They will sue if they end up getting relegated on the back of an end of season circus.
I have had a go at answering each point raised, without needing to resort to force majure in any circumstance. In truth most of the above, while worthwhile and important to note, is not really within the remit of legality. I am not a legal mind by any stretch, but if I can defend most of the above, a legal team for the PL should be able too.
On the substantive points on contract law I have raised though, there seems to be little defence, beyond the "oh well it's not that many players". That will simply not wash in a court of law I'm afraid.
None of this means the league will be cancelled and voided. It only really means, if they had any sense they would.