I've still gotta disagree with the way you put it. I mean yeah it'd be pretty bad if Nintendo did say we couldn't play it and took away all our carts, digital copies, etc., but Microsoft isn't doing that with Halo 2. Sure it's a pretty big bummer you can't play it online over its own MM system and stuff, but like, you still have the game right? You can still go ahead and play SP, Co-Op, and multiplayer with a few friends in splitscreen or xbox connect. Besides, SMW's not got an online mode and it's a local singleplayer, possibly co-op game. You're talking about taking away the entire game with that example, which isn't really the same thing as this, y'know?
I'm not any kind of official spokesperson or anything, but you can still play the game with people, you've just got to do that through XBC on the consoles and private servers/LAN on the PC. It's not quite the MM experience, I understand, but at least it's something right? I don't think I can think of many console games, if any, from older gens that're still capable of their original online suite. That's pretty much a PC exclusive thing as far as I know, and that's 'cause PCs don't have to worry about that sorta thing when you upgrade them. I'm not gonna get into which Halo game is better or worse, or the whole MLG thing. That wasn't really what I was talking about and it's kind of a moot point for me.