The problem is amount of talents these days.
We hardly have more than 2 world class players in PL clubs. Hardly any at Italian, German clubs.
It takes select few in Bayern, Barca, Real to have enough class players to see the football at its absolute best.
So if more leagues come in, the dilution of player quality will be massive.
Couple that with ridiculous player wages to follow, I doubt this is good for football.