Generation or two? How about right now? What about all the mobile payment (MChek, Paymate) companies? Something like WiMAX is def going to be bigger in India...Dating services?

Things are already starting to diverge...it's on a smaller scale right now but it's definitely visible

I wonder how many "young" people they surveyed...Young people tend to be more progresive and make less money. One is not necessarily a direct result of the other...

The market is so different there, companies will have to stop copycatting to keep up

"Yammer was founded by former executives and early employees of PayPal, eGroups, eBay, and Tribe. It is backed by venture capital firms Founders Fund and Charles River Ventures."

Maybe it "won" because it has the PayPal mafia backing it...

Hmm. No math book suggestions but I recommend reading anything by Milan Kundera.