Finish the league that's begun before starting a new one. Completely unfair on all the teams who have played well over 2 thirds of a season to start again.
Take your sheffield utd example, Sheffield could miss out on champions league with draws handed out but they would have Europa league and they will be 100% in the premier league next season.
With your idea they start again and lose out of European football? That's a joke.
Do you think their manage would rather the standings be as they are or that the league starts over?
The league should not start again. It should be concluded as soon as possible. If that means there is a longer break, so be it. If it means we wait a long time and we play the final 10, 11, 12 games then so be it. If that then means the next league doesn't start for ages, then so be it.