I'm actually quite disgusted at how little self awareness these 12 clubs are displaying. They are not even the 12 best clubs in Europe at this point in time (the current CL champion and runner up are not in), let alone looking at the past.
Since the start of the competition the CL or its predecessor was won by a non-founding club 19 times. Another 35 times the final was lost by a non-founding club. Combined in 66 finals 45 times at least one non-founding club was involved.
Clubs like Ajax (4 wins, 2 lost finals) and Benfica (2 wins, 5 lost finals) are not even considered, yet their heritage in top level European competition makes a mockery of the likes of Arsenal's and Tottenham's with only one lost final to their names each.
In recent decades the top clubs in the biggest competitions have been able to tilt the playing field massively in their favour through sheer commercial weight, disturbing the balance of what was a pretty fair game where 11 lads of two clubs turned up to kick a ball around and see who's best. Any half talented Dutch or Portuguese player nowadays has left the country before they've even broken through for their club such is the financial disparity. And rather than fixing this, these 12 clubs, some of which can barely hold a candle to their commercially smaller counterparts without going into massive amounts of debt, decide for themselves to start a closed shop competition to make the gap even bigger?
Fuck the lot of them. Expel them from the leagues and existing European competition altogether right now and let their places be taken by more deserving teams that are committed to fair competition, while they get their ass sued by the EU for competition law infringement.