I think they'll have to part ways with two of the three players I mentioned. Your preferred ending lineup just seems too good to be true. If that were the case they could really win the whole thing!
I'm interested to see late game situations too. Curry had to step aside a little bit for Durant to take over. We saw this with the big three Durant hit in the last minute against the Cavs in game 3. I'm sure Harden will do the same as both CP3 and Melo are very clutch in late game situations.