The general plan is.....
.....to slow everyones PC's down. Every update and my XP box gets slower, there is now a random 30 second wait on after I login where the PC does nothing before its innards get busy. This is pure conjecture, but I think that one in every few "security" updates actually tells the CPU to miss a cycle in every 1000 or so.
Gradually people will come to realise that their PC isn't the mutts nuts they thought it was 2 years ago and go for new one, scratching Intels back, and actually selling copies of Vista.
Conversely, when I'm booted into Linux, where I do my actual work (XP is for Fifa and GTA), the latest updates in the scheduling system in the kernel actually make my PC run faster!!