I think the situation on the desktop market is totally different.
In the graphics industry 9700 dominated geforce 4 series. Even 9600pro (midrange card) was faster. A64 doesnt nearly dominate that much compared to P4. Also the difference between a graphics card is huge for games as opposed to a CPU (HL2 vs. Doom 3 for example). In every day tasks/multitasking, P4 easily keeps up with A64, not giving enough incentive for the average user to upgrade. There is no 64-bit operating system still now, 2 years after A64 debut. 70% of ppl who buy computers dont play games or care for the difference. If they do, they'd rather get a faster videocard (thats why the graphics card market is more prone to fluctuations every new generation - and those generations are every 1 year, minor every 6 months, as opposed to CPUs that dont get a full rehaul for like 2 years, if that). That is why a part of the reason why ATI had a larger market share than its competitor since it has had faster cards for 2 generations now (also 6600GT didn't come out fast enough, while 9800Pro continued to gain midrange share and 9200/9500 cards were a better choice than overpriced FX5200 cards).
Intel also is untouchable on the mobile market. Add to the fact that for those users who just want onboard videocard, Intel has a solution for every market. A64 lacks this variety for onboard graphics card on their motherboards on the desktop for sure. On the mobile market, their cpus dont have as long of a battery life; and the notebooks are much larger and heavier. I remember seeing guys wearing Centrino shirts on downtown last summer just showcasing the technology to people on the street. AMD hasnt shown its logo on national television in 10 years.
Now given the average user hears: 2.2ghz A64 DDR1 vs. 3.6ghz P4 DDR2, which one sounds like a faster system? The availability of choice at the stores like Futureshop, bestbuy, etc, is like 90% P4 systems vs. AMD systems. So it's only more probable that more people are likely to purchase a P4 system as a result of choice and higher percentage of available choices. Then you add Sony, Dell, HP, etc, which focus their marketing on Intel systems as well. And the fact that Intel is safe, proven and stable (by historic measures, and from user experiences).
Why do people buy Toyota Corollas and Honda Civics over Mazda 3 for example? Sometimes, what matters to an enthusiast, isnt what matters the most to the general population. If Intel means a peace of mind, fitting in with the crowd, and no hassle in the mind of the purchaser, they wont buy AMD.