It seems they’re indeed slowly building up to the older versions of the characters.
Aliens such as Rath and Humungosaur, and villains such as Darkstar (Michael Morningstar) have all appeared throughout the reboot.
Seeing as how the reboot is currently on its 4th season, it has already taken liberties from the series prior to it. Duncan Rouleau, the co-creator of the original series who is also a partner in Man of Action, may have confirmed on Twitter we could be getting teen Ben once again like the one we see in Alien Force. I mean as long as they keep Kenny I wouldn’t mind a Ben 10,000 series, but if they are trying to bring new people while still catering to the old I would MUCH rather Ken 10 than a reboot. It has always been a theory whether or not this version of Ben would soon grow up into the mature Ben we see in ‘Ben 10: Alien Force’ and well recently. Until a reboot was made which created an entire new continuity. Because of the success of the series, it received many sequel series such as: ‘BEN 10: ALIEN FORCE’, ‘BEN 10: ULTIMATE ALIEN’, and ‘BEN 10: OMNIVERSE.’ All of these series served together in their own continuity. BEN 10 is one of Cartoon Networks most successful franchises within their catalog which started way back in 2005 and ran though 2008. Ben 10,000 would be pretty difficult to make compelling conflict for given how powerful he would be, and I've heard that marketing and Ken 10 don't really get along (take that with a.
Despite the fan demand, an OV sequel has never really been on the table, nor has a Ben 10,000 or Ken 10 show. In 2016, Cartoon Network created a reboot to the hit series, BEN 10. A reboot sequel honestly seems inevitable to me.