I'd go just to see Myers. Always loved that guy. I have a feeling it's going to get a pretty considerable family crowd, esp. since Elf has been out for a couple weeks now.
If you can type, you are not the target market for this movie. You may go (which I am going to), but this movie's numbers depend upon every child and their parents going.
I think it easily does $70M based on good timing of the release.