The Bungie Halo era games had problems, sure, but overall were a masterpiece of a series. Everything since then has been ok at best, and borderline insulting at worst.

So much retconning, characters with zero arc, contempt towards the fandom, and build up with no onscreen payoff.

From what Halo Studios has announced regarding Campaign Evolved, and how they've dug in their heels in response to fan feedback, I wish I were as hopeful as you.

In my opinion, Halo should have always remained a Bungie property with connections to the Marathon universe, and neither series should have ever been a live service game.