Before they are modded out, take this opportunity to get some cheap exposure therapy. Who knows it could rid you of your phobia.
I probably won't be able to keep my hands off of the game, and I assure you I'll give it a try, but really, the modellers and animators in the developer team have been
very talented. Unfortunately

I can't really say, because as I and other people have mentioned phobias are a very irrational thing, but I think that I'll maybe manage for some time if the "kill" console command is still around, so I won't have to be confronted for more than a few seconds before I can run away screaming. But I dread the day that I will take damage in the middle of a snowy forest, turn around and stare into the face (or whatever) of a giant spider. If that happened, I'm afraid I'd be unstable for days*.
*I realise that it sounds a lot like I am exaggerating. I hope you understand

EDIT: Though, if Skyrim "fixes" my (so far) life-long and honestly speaking pretty annoying phobia, I'd buy an extra 20 copies for good measure.