Personally I think it's all about cash. Intel is selling a competative product with the years of advertising pounding Intel into the consumers head. Intel advertises and AMD does not. To the average Joe, it's just a computer, Intel is a well known name, and the computers will sell without going into the pro/cons of differing platforms. Also, I think there is too much invested in the P4 platform to retool and switch over to Dothan in high volume.
Other than on an enthusiast forum, most people don't know performance differences nor do truly care. A 200 fsb and PC3200 platform really have nothing to do with the cpu other than the multiplier. 200fsb/PC3200 capable motherboards and memory have been here for a year and 1/2. They just need to put it all together. And that won't happen until they squeeze every Prescott penny out of all the Fabs.