Youre forgetting the dealers will be limited in number and the cost of second hand games if available will be higher than now. Will ruin the concept of just popping down a local second hand shop for the latest games at half price a couple months after release.
Being tied to the net for even single player offline games is fucking gay.
Only some of the gamer community use online multiplayer games.
The games "only available on XBOX" has NOTHING to do with the quality (or lack of) of the console but deals between microsoft and the game writers. Microsoft will have paid dearly for the privilege of having some top new games tied to xbox only in the hope it will draw new customers to the console.