This thread is still very much alive
, it's just the lull in between the rush that was the price drop/ambassador period and the holiday game-a-thon hitting us in the next couple of months. I can guarantee you that between November and the end of the year, you're going to see another surge in 3DS owners on this site looking to populate their Friends List. That's also the time when people who usually lagged on accepting requests finally get around to mutually adding others to complete the chain.
I continue to recommend to everyone seeking to populate their Friends List here to pm people that you have added so they will know to add you in return if they haven't already.