Migrants to IJ, 2007

I have several friends who are hesitant to come over to IJ because they're not sure the site can take it. Is there anyone who could point me to info about Squeaky's preparations for handling an influx of LJ refugees? As for the User Stats, it says there are 45,301 total members (atm) but only 1680 are "active." What does "active" mean? That they've posted in the last day/week/month?