Even if it did come back for awhile, it would not be the same. I love Halo 2 and I wish I could play it on live all the time but the game has changed sooo much.
My favorite time to play was when it first came out until about January 2007. Up until then the game was still amazingly fun and the glitches weren't out of control (I even mostly played MLG and Team Hardcore and I feel this way). If you go on to XBC now, everyone knows how to quad shot and there are no longer any "secrets" in the game.
Halo 2 will always be my favorite game ever but nothing beats the first 2 years of that game.