Not less fair than relegating teams at any level. I agree that whatever gets done is unfair because teams will have players available who otherwise would not have been. Spurs would have finished the season largely without Kane, but any resumption he'd be fully fit for. He's the most obvious...
It would be profoundly unfair for this season not to finish. The priority has got to be finishing this season before any others can begin. Shorten a season which hasn't begun to fairly finish one which is 2/3rds completed.