Look, in their time Real Madrid, Bayern Munich, Barcelona, PSG. Juve, Inter, Milan and many others have all financially 'cheated' in some form or another in the past UEFA have been left to do little - a rap on the hand for some outrageous financial doping.
But they couldn't avoid this (which they were trying their best to do) when the emails make ManC's guilt so blatantly obvious to everybody and everyone.
If they banned PL clubs, they'd soon get legally ripped apart for all the nonsense in the past that they'd buried, hidden and run away from.
The 'old' guard clubs in Europa have a massive hold over UEFA - just look at the positions of power at all levels in UEFA and you'll see how deeply protected they have been and still are.
e.g. Italian football should have had a 10 year ban by now.