I think it's a great idea. It's a long shot, but not because it isn't possible...more because the current lockout will end before enough people put their minds together to make a new league happen.
Obviously, the players would need a ton of help to establish and run the new league, but it isn't like they dont have the $. True, they dont have as much $ as the current owners taken individually, but as a collective, the top players certainly have enough to get a league off the ground.
It wouldnt be near as large or global as the NBA, but so what. If the new league featured the best talent in the world, then it would become the new NBA quickly. Sponsorships, TV deals, and arena contracts would come in a wave as soon as the new league was able to convince people it was for real. A few sell out arenas featuring big names and a smooth operation would make that short work.
I dont see it happening in 100 years, but it's certainly possible, and might not be a bad idea if the right people gave it serious thought