So far a whole buttload of TLDs have failed to dethrone .com. I suspect adding a huge collection of new TLDs might actually make .com _more_ valuable. After all, if you hear about some company or product, are you going to guess foobarbiz.randomstring? Heck, most browsers will guess foobarbiz.com for you.
No wonder Google wants in: (a) they can profit off their worldwide infrastructure and (b) everyone will have to use Google to figure out which .foo or .bar they need! /cue maniacal laugh
