...like the CTO of Lindenlabs who dreams of an infrastructure that can support 10 millions of concurrent logins or like the CEO of Lindenlabs who dreams of 1.5 billion people online in Second Life or virtual worlds (the statement is in the current Avastar) but at the moment I and most other people would be very glad already when SL would scale better when more than 30.000 people are online at the same time.
This seems to be the magic number at the moment after which SL goes haywire.