The only thing delaying the announcement that the season is getting cancelled is each authority is wanting someone else to say it. If the FA say it, epl will no doubt sue them for lost earnings, if the epl cancel it, the fa will sue them. Eufa, fifa - all the same
Although they all want the same, finances dictate that none of them will call it.
The season will just keep getting postponed until the government says cancel it.
This is basically it. You can forget any hope of leadership in this situation. The government, UEFA (who have been the best on the question), PL, FA etc will all just want the other one to make the decision. All of them are going to try and act like they want the season to keep going (hence the cowardly statements from the FA about wanting to extend). It helps with there narrative, but it also helps down the line if there is a legal challenge. They will use the defence that voiding was the only decision left for them after external factors ensured they had no option left.
If that approach is adopted, any side (say Leeds for example) would not only have to prove they deserve to be promoted (even though they bottled the last 2 seasons from a similar position) and that all protocol of voiding incomplete seasons was wrong, but also crucially that the PL/FA had any other option available to them given being boxed in by UEFA/Government. So it strengthens the defence.
So I'd expect a statement, some time in late May saying in essentially- "we were committed to ending the league, UEFA demanding it's finished by June 30th, and the government refusing to allow us to play behind closed doors made that impossible, therefore we have to cancel"- obviously legally worded and much articulately written than that, but thats the basis.
Of course, within this scenario the PL have to be seen to be keen to start it at this point, otherwise people are just going to say "well you said you wanted to terminate from March." It loses credibility that way.
As a final aside, lots of Liverpool fans seem to think the :"authorities working together" will benefit them. It won't. If authorities work together, very quickly they will al agree it has to be cancelled, and you would see a joint statement, which would state clearly that if they want to sue anyone they have to defeat the collective might of the FA, PL, UEFA and the government. They may even try to drag the police into such a statement. Terrible PR to go to court on that basis.