In regards to the campaign, what could 343i do to make you give them major cred?
For me, it’s if they’re willing to abandon the covenant. It doesn’t really make sense from a story perspective to include them, and it’ll give an opportunity to completely reimagine much of halo.
It’d also piss lots of people off.
Not have it all from the view of the chief. I wan’t to play at least one mission as an ODST or an Elite.
Have large epic structures, which don’t have to be absolutely swarming with enemies. In Halo Reach everywhere was near enemies, which was nice, but it wasn’t as scenic as Halo 2’s campaign, partiality when you are on Halo.
Edit: by the way OP, you are on your 117th post 
Well, To be honest in my opinion its down to the story, A well written plot would be the best thing they could do.
Possibly followed up without a cliff hanger, just a Halo 1 style ending is good. Halo 5 should have another cliffhanger like so:
“Master Cheif what are you doing aboard that ship?”
“Sir, Finishing the fight. AGAIN”
Then the credits roll.