It's a shame, because despite being extremely disappointed with KH III and with the direction the saga took from BbS onwards, KH and II are some of my favourite games of all time and I would pay indecent amounts of money for a portable version. And I'm sure I'm not the only one.
But hey, it's too hard to port some PS2 games to a machine dozens of times more powerful and three generations more modern. And, even if by some engineering miracle they managed to port them, they wouldn't even sell well. I mean, there's no way they would do better on the Nintendo Switch, with 60+ million consoles and with a tradition with the franchise doing well on previous consoles than... I don't know, Xbox One and their 40 something million consoles and its great sales performance with japanese games.
Yup, not worth it at all. Let it go... let it go...