Jack, just what have you done for those other virtual world communities? Seriously, be honest; if you've done nothing, please come out and say "We've done nothing." If you're not planning on doing anything for those communities, find the testicular fortitude to stand up and say "we're not planning on doing any more for any other virtual world communities." Just so those communities can get a better idea of how they're expected to be treated when they do magically decide to ditch their Warcraft-fuelled world and jump ship to Second Life, as you're expecting.
And also, let's straighten this up too: the Tweet you made to link to this post said "Hello to cool new networking technologies in Second Life" - please delete that Tweet and rephrase it to read something a bit more accurate. Something along the lines of "Hello to recycled technology that we purchased from someone else." Stop using the word cool. Nothing Linden Lab does is 'cool' any more.