You have some really good, thoughtful ideas there. I really think tho, that any of us, here from back when halo started, will never compromise the idea that traditional arena shooters are not obsolete. All of these "rennovations" to the core gameplay, change exactly what makes the genre different.(How it plays)
I think time and resources need to be put into thoughtfully designing maps and playlists that work well, without sprinting ever being brought to question. It's a hard question nowadays to beg of a major developer, to make a game for it's hardcore fans, rather than the other 80+% of it's margins. Even if this fan-base had been built on over a decade of play.