Welll the past console are do not matter anymore, Im more talking about the current gen. (PS3, XBOX 360). If we ever are lucky enough to have 2K10 I know that it will only have another roster update + Thunder. and that's it.
On the other hand 2K/EA will continue their rivalry on the Current Generation which I think will be coming on a potential transition if Live will put a good fight this year with '10 and If 2K will slack off. Live's only/ most lacking is the solid gameplay which 2K has.
As for the PC, if Live will port their next b-ball and with the same quality as PS3/360 next time then it will be another battle.