No it's not. If they're doing a PS4 bundle collection then it might as well be the entire saga and not a bundle that would make a new player want to rip their hair out from confusion. Which, is entirely counterproductive.
Do you have any idea how many people complained over KH 1.5's announcement that KH2 wasn't part of the package? If you look at the trophy percentages for 1.5 on PS3, you'll find that people hardly bothered with Re:COM, and that a lot of players didn't even watch Days.