Do you think Guaranteed contracts are good for Leagues quality of play?

So the NHL, NBA and MLB all have fully GTD deals and we know their respective unions would never give that up but do you think that those leagues would be better if deals were only partially GTD like in NFL. Teams would be able to rebuild quicker and players would continue to give max effort rather than get comfortable after getting their payday. Now I'm pro player and not pro owner so you could force teams to spend a minimum amount(salary floor- only MLB needs this)