There's no way you can have relegation without finishing the season - Villa even have a GIH that potentially puts them clearRealistically I think you have to negotiate extraordinary parachute payments to the clubs that are relegated, hand Liverpool the trophy and move on. There is no "good" solution. Any starting over, or running a combined season will unfairly rob some of the earned benefit of the matches they won this season. Just much easier and cleaner to call this one done and give the relegated clubs extra money not to make too much of a fuss.
Probably need to start wondering about next season, really.
14/20 majority rules in the PL and the best thing for the majority is to restart last season as if it never happened