If I'm understanding this show's production correctly, it's being written as a 10-part miniseries, which would mean that there wouldn't be a "second season" of any kind. In other words, Tron: Uprising would only span those 10 episodes. Besides, Tron: Legacy has to happen some time, right? IMHO, it wouldn't be right for the franchise if they kept delaying things in order to keep it going for as long as possible. Not only that, but it would take attention away from both movies. As far as I can tell, that's not what they're going for here.
Cartoons aren't "just for kids"...but they're not just for adults either. They're for everyone.