Yeah I think it should really be the last title they release on old gen but knowing 2k they will milk another few years out of it but your right it doesn't seem fair to charge nearly the same as next gen with so much missing from its next gen counterpart.
I messed around with myleague last night and was pleasantly surprised to see they included the nba Cup and courts to match which is nice to see but is having theses courts in the game at the cost of not having the upto date courts like the Suns, Wizards, Kings etc? I think I'd rather just have the actual team home courts than the gimmicky nba Cup.