You also have to understand a lot of these TV/movie franchises have been going on since 2006 or later...they have put in about a decades worth of work- without a lot of us even noticing it. Robert Downey Jr is now in his 50s; dude has been playing Tony Stark since 2008- Chris Evans has been portraying Steve Rogers since 2011. Supernatural has been on TV since 2006(I started out watching this show and fell off in the middle of season 1); Game of Thrones- cant remember when it started, because I didnt start watching it from the beginning; one of my fam told me about the show and I picked up the 1st 3 seasons on blu-ray in 2013...I was hooked ever since.
The good part is there is always stuff that will replace TV shows/and movies ending. I felt the same way when The Shield & Niptuck ended, only to be replaced with Sons of Anarchy and Breaking Bad; once those shows ended I've replaced those with other shows...
Though The Avengers series might be over, there will be other Marvel movies that will fill that gap(Disney didnt buy back the rights to X-Men and the Fantastic Four for nothing); and as per Disney, they didnt buy Star Wars only to crank out just 3 more movies and "that's it"- there will be MORE Star Wars beyond that(though I hate that those slack ass Game of Thrones showrunners will be in charge of these new SW films). They also bought the rights to Avatar(the James Cameron movie), and are planning to release a whole slew of those supposedly; though on the flip side of this it's really feeding into my disdain for all these damned sequels.
I cant say too much about CN shows; I barely watch CN anymore. I do wanna check out Craig of the Creek, and occasionally watching a Teen Titans GO episode here & there- but I dont even watch Toonami on the weekends anymore and that was one of the main reasons I pulled to get cable(I watch more anime on Hulu/Crunchyroll/Netflix than on Toonami).