I recently bought the digital download of diablo 2 for my mac. It runs great but I forgot how much clicking and dragging is involved. I wonder if its actually possible to wear out the glass trackpad click-ness. Is warcraft 3 just as bad? I havent played that in awhile either and I may check that out as well.
I imagine if you use it sufficiently long, it will wear down and break (as with anything mechanical), but these things have been built with extended use in mind. So, I wouldn't worry too much about it.
I play Call of Duty 4 on my bed on my chest with my mouse... I have no problem doing that (although my kill-death ratio significantly drops for multiplayer mode XD) I just use my notepad from school for my mouse pad
External mouse with mouse pad. Works even on couch: put mouse pad on seat cusion and put mouse on pad. I have a xtracpads Pro HS mouse pad in my laptop bag, and the hammer for my desk.
Get a laser mouse and not worry about it working. I use my mouse on the bed or bed sheets a lot with no prob. Just don't cram your mouse into your sheets.