That scares me as well. Some people have theorized that there are a lot of dragon glass weapons in the crypts of Winterfell...I don't know how to feel about that. It would feel sort of like a deus ex machina moment, especially if for instance a direwolf led mankind into the crypts and lo and behold: the only weapons that can defeat the Others! Dunno...
Based on what we've seen and heard thus far it seems like the Others would have no problem killing everything in their path until dragons arrive.
I hope that theory is wrong. GRRM wouldn't pull a stupid stunt like that. Stacking dragonglass enough for a large army in the crypts. Hopefully the crypst have an other story to tell.
Nah, I refuse to believe this.
The Others obviously have some limitations. Otherwise they should already be at the gates of Kings Landing. But you probably know this already.