Who knows?! As Rooney said on Twitter it could be a perfect opportunity for the authorities to reshuffle the Football calendar ahead of the Qatar 2022 World Cup which is being held in November / December for safety reasons.
So, for arguments sake, let’s assume your suggestion is accurate and the current season finishes in December, then the new 2021 season could be started in March after the usual 2 month break (though after all this, I’m sure the players will be reasonably well rested).
If that was the case, then that season would end in circa November / December 2021. Assuming that same schedule ran in 2022, it would mean that the domestic season would finish in November 2022 and the World Cup in Qatar would commence therafter - rather than being some mid-season spectacle.
Again, it’s all ifs buts and maybes right now while the world is trying to catch up on everything, nobody has any clear answers.