I am in a bit of confuse here, but is it true that the only obstacle blocking the NBA season is players' refusal to have a 50-50  split of revenue?

I believe players already have their initial salary right? so another 50% share of revenue is actually an humongous increase to their already high salary income, but still they want more?

I am not certain, but for the case of NBA players to play elsewhere, will they receive more than they receive in NBA?

And there had been suggestion that players can start their own league? Will that work for everyone?