I'm not in the industry, am I? Me listing ideas would be like starting a fantasy booking thread in General Wrestling. It would get nothing accomplished.
Quoted for pure stupidity. Halo was not innovative in the least bit. It was "Marathon on a console". Personally, I think Turok: Dinosaur Hunter was more important than Halo when it came to "innovating" FPS on a console. Hell, even Turok 2 had weapons unique to the series like the Cerebral Bore and the Shredder, something Halo cannot active.
Which is exactly my point. The FPS genre is getting very stagnant. But there were plenty of innovations before the "Halo era".
The improvements Doom made over Wolfenstein. Duke Nukem 3D proved the genre didn't need to take itself seriously. Quake, while very generic today, was the first real successful pure 3D FPS. System Shock / BioShock and Deux Ex have unique takes on the genre. Turok proved the genre could work on consoles. Goldeneye was the first successful multiplayer on a console FPS. The Half-Life series is still considered by some to be the epitome of FPS gaming, but I've never played it so accurately judge. All these games did more individually than the entire Halo franchise ever did aside from sales.
And the Metroid Prime series are not First Person Shooters, aside from Hunters.
And that is why I usually never play the genre outside of TimeSplitters.