Spain is not as big as Italy or England, no reason to think a healthy, 20 team Liga is viable. Barca has announced it is willing to share more of the big TV money, but they want it spread among fewer, stronger clubs. If RM agrees, this will happen.
Barca might want fewer Liga games (and fewer Copa) to allow it to play more in some sort of multi-national super league. This could be a revised CL or some new setup owned by the big clubs. The big clubs are also pushing for fewer national team dates. The clubs need to work this out with the top players, which should be possible since it will permit higher player pay. Money talks, all this will happen. This will improve the sport.