I’m inclined to think there would not be a fan reboot - the TOS is pretty strict on that sort of thing and I’d imagine KI would keep their IP protected.
I would hope Disney wouldn’t buy it; they don’t need yet another deeply beloved franchise to suck the soul out of for profit.
I wouldn't be surprised if a revived game surfaces. Toontown and Club Penguin have one and now recently Pirates of the Caribbean online has several that just popped up. Players passionate about their games always find a way.