No, there's the Vanir in Pegasus. Granted, they wouldn't help, but they are Asgard, kinda, and they are alive.
Nowhere near enough. Space ships have very hard upper limits on how many people they can transport at a time. Over tax the life support systems and everyone aboard slowly suffocates, a fate likely far worse than whatever would destroy Earth.
Evacuating Earth assuming the Stargate 'verse could be done with Wraith technology. Dematerialise people into millions of those machines the Darts use. The Daedalus, Odyssey, Apollo, Sun Tzu, and George Hammond can then transport them wherever, and start rematerialising people.









