For me? Well, it depends on a lot of topics:
1) What the new characters will look like (appearance/personality-speaking);
2) If the next saga's villain/villainess is just as dangerous and cunning as Xehanort;
3) The next saga's main theme/plot;
AND LAST, BUT NOT LEAST (AKA:The most important aspect):
4) How long the time gap between KH3's and KH4'S release date will be.
With that last thing said, many of you might be thinking right now: "Don't be impatient. These things take time". Yes, I'm clearly aware of that. I try my best to be as much patient as I can be, believe me. But, the real point here is: "Nobody, and I'll say it again, NOBODY has infinite patience". Patience is good, sure, but, it has its limits. I don't want to wait another 10 years for a numbered title again, ever. However, this might not be the case. We'll probably have to wait another 10 years (again). Why, you ask? It's simple.
Many members of the KH community are asking Nomura for a full remake of Days and Re: Coded (as playable games, of course). And Nomura will probably consider these requests and might actually remake one (or both, depending on the demand) of them. Besides, I remember very clearly that I read an interview in this site (Sorry, can't remember which interview was, though) that he also said that after KH3, he would like to tell the "full story" of 0.2 (What he means by "full story", I have no idea, because, 0.2 seemed pretty good and complete, despite how short it is). Not only that, but he's also in charge of Final Fantasy VII Remake (Worth reminding that he announced this title just a few months after he abandoned Final Fantasy XV. LOL, can you guys imagine if Nomura hadn't stepped down from FFXV's development? He would be in charge of 3 big titles and FFXV wouldn't have been released yet. It still would be in "Now in development" stage). And, please, everybody, let's be 100% honest here: between KH3 and FFVIIR, which title do you think he will give more attention? Seriously, let's say the cold and cruel truth here: of course he will give more attention to FFVIIR. Doubtless. It's the most iconic game of the franchise and Square Enix's cashing cow. Oh, and let's not forget that, while he remakes Days and Re: Coded, he'll still be in charge of directing the "episodes" of FFVIIR, so the remake of the KH titles will probably be delayed.
Guys, from the bottom of my heart: I don't want to wait another 10 years for a numbered KH title/game. This is a complete disrespect to the consumer and the fans. And this situation gets a lot worse when Square Enix makes us wait 15 months for KH3 news, and, when the time comes, they don't keep their promise. Not to mention that, when they show us a trailer, it's one which has stuff we've already seen in a past event, but with only 1 or 2 new scenes/shots (You know, the D23 Expo Japan 2015, which was pretty much the same trailer from E3 of the same year, with just 1 or 2 new stuff and that's it). Oh, yeah, let's not forget of the lovely and sweet private trailers that were only shown to people who attented a special event (the KH3 trailer at 2.5 HD Remix launch event back in 2014, and, of course, the private trailer at D23 Japan back in 2015).
If Square Enix makes us wait more 10 years between KH3 and KH4, only to do all these bullshits again, I can assure you: I will give up/quit/"jump the ship" after KH3, for sure. Those KH days and waiting days will all be behind me (temporarily or permanently).
Anyway, what about you guys? What are your opinions on this thread?