I saw the first one, "Elling" along time ago, and I liked it. It was a quirky character study where you didn't laugh at the people, but with them. I think your comments describe it quite well. But there was actually much fuss about the film here in Germany, and I thought it didn't really deserve it. It's certainly an entertaining and well-made film, but imo not much more.

A remake could actually be interesting, but Hollywood would probably it into another American Pie -style comedy with two nutcases instead of teenagers. 
If it's done badly enough, it could be enjoyable, but I doubt that will bw the case. I just hope they won't try to make a serious "message-oriented" film.