I was in California last month and as far as I could see Americans are still heavily into buying SUVs, possibly Governor Arnie's cast-offs, and seldom having more than one person at a time in them. (There are priority lanes on a lot of LA motorways for cars with two or more people in them, but they were going almost unused.)
Having said that, they've been happily buying Japanese cars for years, but I think reliability rather than size or price may be the big factor. Any Americans out there please feel free to set me straight on this.