I think that is not true. It's hard to find one on EBay. Everybody I know that has one loves it.
Even Scott Yee has one. Uncle Dave just doesn't have a need for it as his situation changed and the Pa4X will work better for him right now.
The next totl Korg will most likely be in late 2019, if they stay according to pattern.
As I said, I don't even buy green bananas right now with my health situation, so I'm certainly not in a waiting-for-keyboard mode.
ALL the current middle and top of the line arrangers are fantastic. I can use any of them very happily.