I've been to the ones in Barcelona and they are still very cool and useful. The indoor stadium still regularly gets used for conferences, concerts, and other large scale events.
So sad to see these marvels going unused. There are so many things that they could be used for. Some entrepreneur will figure something out.
Yeah I have seen pictures of them continuing in their use in Barcelona, and I am really glad to hear that. That's how it should be. :) I agree with you!