As always the devil will be in the detail. Who governs this league? What protections are there to prevent the goalposts being moved? What are the financial arrangements? How are the enormous funds this league would generate to be allocated? I could go on, but provided the answers to these questions are satisfactory and a chunk of the revenue is redistributed to the football pyramid I'd be strongly in favour because I feel the concept of a league containing Europe's best is exciting and inevitable. The Champs League, especially the qualifying stage has become stale and predictable.
As regards football fans being resistant to change, it was ever thus. Substitutions, 3 points for a win, the back pass rule, the Premier League, and now VAR, were all opposed by fans who wanted to maintain the status quo, but were introduced and quickly became a part of the football furniture.