As I have said before, there are people, including myself, who liked watching The Batman. Besides, a show lasting for 52-65 is a pretty good run. That's nothing to ignore considering most shows are lucky if they get that far in these days.
As both Blackstar and Silverstar have mentioned quite well here, I don't think you have to watch a reboot if you don't want to. I can understand your feelings, but I don't agree with having only one definitive series for TMNT. A reboot is chance to get some money out of the franchise, obviously, but it is also a chance for other people to have their own interpretations of the characters. There is no universal understanding of superhero characters, including those from TMNT, since the comics themselves are often rebooted. If the idea of a possible reboot bothers you so much, then I do think it would be better overall for you to just be content with the series you're already happy with.
For the really small episodes, they're nice and all, but I do wish that the chapters weren't so short. It feels really odd when most of them end with the turtles not doing that much outside of getting new weapons or having a really short fight scene. I know the general point was to make them this short, but it doesn't feel like they've done that much to me for some reason.