Unless and until La Liga clubs force Real and Barcelona into collective TV bargaining like the EPL, their revenues are not going to pick up. This year, Reading which finished 19th in the PL and got relegated earned 40m pounds (~46m euros) from TV broadcasts compared to La Liga's 3rd placed Atletico which earned ~42m euros only. And with the new premier league TV deal coming in from this year, expect the premier league figures to increase by as much as ~70%. The 20th ranked PL team will earn about ~70m euros from this year.
So far in the transfer window we have witnessed a massive loss of talent in La Liga. Players like Falcao, Negredo, Soldado, Navas, Thiago, Llorente and Higuain have opted to leave to Spain and play abroad. La Liga lost a massive amount of talent in the attacking third with its 3rd, 4th, 5th and 8th top goal scorers (a shocking 93 goals between them) leaving.
Atletico used less than 3M of the 60M to replace Falcao with Villa, the rest going to ease debts. (Costa could be going to Liverpool soon?)
Valencia is headed down and fast and will most likely find a cheap replacement for Soldado who was our only threat most of the season.
Sevilla is the only team that have made any real replacements with the loan of Marin and signing of Gameiro.
The next season will be the same as every other season. Real Madrid and Barcelona will battle it out for the title meanwhile the other teams drag behind. The gulf of power between them two and the rest of the league is getting worse as time passes on. We can only expect the third place team (my prediction is Real Sociedad) to finish a staggering 20 plus points behind them.
Competition is getting weaker and weaker as anytime a team gets any real talent in its rank they are quickly snatched by Barcelona or Madrid as first picks and after teams overseas get at them.