It's hard to say.
Only very good spanish .org names achieve good numbers. Undeveloped I would say this one couldnt go over low $XXX as max.
With regards to its development potential, I see two possible ways: sport stadiums or disease phases (both translate to "estadios" in spanish). Considering the .org extension I would say this name is more likely to go with a medical information site rather than a commercial site to sell tickets for example. However, information about football stadiums all over the world is another possibility.
Good luck!