[mdo7]

As Guyver Spawn said, there are a lot of factors on why action/adventure animated shows are dead. I agree video game is one of them. But there are other factors, since mid-2000's, Saturday Morning cartoon have already been on the decline. It wasn't until 2014 that it's been acknowledged that Saturday morning cartoon are dead:

2014 article #1: Saturday Morning Cartoons Are Officially Dead

RIP Saturday morning cartoons, and the reasons why they’re dead

So yes, when Saturday Morning cartoon died, that could've also hurt action/adventure animated shows. Video game is another factor. Streaming sites like Netflix, Amazon Prime video, etc... could or maybe help future action/adventure animated shows (we have to wait and see). But I do see old school action cartoon like GI Joe and Transformers on streaming site like TubiTV, so if you want to show your children what old school cartoon look like, they're on there.