I think that is because of the economic situation in Spain. No rich Russian, Arab or American would invest serious money in Spanish business, therefore, none of them would invest in Spanish football. So, no "new threat like Man City" will occur in La Liga. On the other hand, I think FCB and RM are simply too strong for anybody at this moment. If you would imagine a fantasy league with MU, Chelsea, M City, Arsenal, Liverpool, Tottenham, Barca, Real, Valencia, Atl Madrid, Benfica, Porto, Milan, Inter, Juve, Munchen, Dortmund and Lyon, the title would still be decided between RM and Barca. Any of the above may beat RM or Barca in UCL, but in a league I think they would fail...today...maybe 5 years from now things would be different. But today I think RM and Barca are too good, have too many incredible players, have young and extremely talented coaches, etc
there is no other team in la liga who even can match the level of this 2 spanish gianTs... REAL MADRID & BARCELONA.
there is always fight between this 2 club for top spot...from decades...
you can see there is always minor diffeence between this to and rest 3 and 4 you can see there is mountain to climb nearly of 20- 22 points....
and if you see in BPL there is no such problem....
there every single club give tough fight....
and there is 5 giants in BPL and new threat rising every year as this year you can see MAN CITY for title race, next year may be liverpool and after that SPURS and so and so...
but in LA LIGA this would never change .....do you people know why..???