I think it's safe to say at this point that most "techy" people have moved to Macbooks - by "most" I mean over 50%. And if you happen to browse tech sites there's a good chance a majority of them are using OSX now.
I agree: in Mexico, for example, all geeks run Linux (Ubuntu if they're not very geeky, Gentoo if they consider themselves hardcore). Geeks widely regard Macs as being not bad but only really useful to show off your wealth.