I said when FFP was first mentioned and I say it now, Fifa/Uefa/FA/whoever will just fine super rich clubs who break it, its a means to tax the super rich clubs and put money in their own pockets, nothing more.
Ban maybe one club who can't pay, scare the rest into paying their fines, sorted. As long as the fines are the same or less than the club would make by being in the competition it would still be worthwhile paying, though I would imagine a scale much like championship is supposedly doing(done?) where you go a million over its a small percentage fine, as the amount you go over increases the fine increases drastically. So go 1mil over, pay 100k, go 10mil over, pay 5+mil fine.
When more money goes into a sport, everyone wants a slice, this is just Uefa/Fifa/various FA's getting their slice.