Yes it might be possible. It is my desire to develop the next Kingdom Hearts on the existing platform, but the problem with a new console is that it has new technical requirements. So, yes, I'm willing to create something on the existing console because when we aim for another non-existing future console, the release of the title will be far in the future. That's my concern.
Lastly, Nomura stated that he often has to "sacrifice my private time, my marriage, my family time" to stay on top of all his current projects. Regarding the future of Kingdom Hearts, all of this means that Kingdom Hearts III will soon be in the concept stage.