This Forbes article pretty much confirms Earth's Mightiest Heroes is being ushered out in favor of a new animated series simply titled "The Avengers.". I can only guess that this means the original rumors Of marvel making an avenger's in the ultimate spider-man universe is true, along with the rumor that they will be self-contained episodes.
This has me pretty worried, EMH is one of two animated series that I can stand to watch with the kids in my fanily and sadly Spider-Man isn't the other. The most successful cartoons, non comedy, with the under 14 demographic seems to contain long haul stories, and with the exception of Batman: TAS the same was true when I was a kid. X-Men and Spider-Man in the 90s were hugely successful from what I've read and they were marvel titles too.
I don't get why they want to scrap a winning product