Yep. For a while in the H3 era we got stuck on "oh there's this massive cache of technology! But we have to destroy it to deny the Covenant getting access. We won, but we're still on the run!" stories, and it got pretty played out. The status quo had to shift.

I can understand the people upset with Halo 5's story because they had hoped the ramifications of humanity taking over would become a prime focus for a game; instead we seem to have brought a rather sudden end to that hegemony.

As is though, the story going forward might be humans on the verge of defeat united against a fanatical group of AI, all while trying to uncover the mysteries of a long lost civilization whose technology could give us an edge in the war for our survival. :P