Sonic Boom continuing is no different from the days when Sonic X ran parallel to the games. Difference with Boom was they tried, and failed, at making it an all encompassing franchise. At this point, Boom is mainly TV and toys, with a lesser focus on games (3DS and mobile) and comics (the occasional story in the grocery store Sonic digest books).
Ninja Turtles is doing fine with multiple versions running concurrently, we have the IDW comics, the Nick TV show, and the live action movies, not to mention the throwback 80s merch.