You think a PS3 priced at $350 would get more demand than the Arcade, Pro and Elite SKUs, in the U.S.?...Pick one of these 3 options.
1)No, no and no.
2)Maybe, it'd depend on other things as well, such as advertisement, a good game to go along with the package,etc..
3)Definitely yes....
3.1)...and by a large margin too!!
3.2)...but only a bit more, nothing really threatening to the 360.