Football works in cycles. Spain have had a fantastic cycle of European dominance at club level over the past 15 years. Now this cycle is coming to an end. Instead of it being somebody else's problem, they should have been first to flaunt themselves to achieve such levels of investment to retain their place at the top of the tree. Partly this has been achieved by shady transfer dealings by both Real and Barcelona, both have been sanctioned and had transfer bans levied against them.
Now the shoe is on the other foot and clubs in other countries are threatening to take over and become a force in European football, they can't handle it and their dirty transfer dealings won't work anymore as they do not have the levels of finance as other clubs now have.
Some day, this will all end for Manchester City too, and PSG. But the long standing fans won't piss and moan. It will hurt, but we have been in worse places.
Suck it up Barca. Your day in the sun is coming to an end, but it will return in the future.