Fewer teams have won the EPL since its current incarnation than La Liga in the same amount of time, so I don't think it's as bad as some people make it out to be. It's really just the last few years Barcelona and Real Madrid have been absolutely dominant. I do agree that the TV money should be divided up differently, but as shown by the EPL which has got a better (imho) way of divvying up the money, it doesn't necessarily mean that other teams will immediately start winning.
For me its the financial side, half the sides are in a dire mess. But then i hold the LFP just as cupable. Too easy for clubs to take shortcuts on their debt