we do not want them positioned as cache drives. we want them to be positioned as boot disks and other disks.
Well, "we" isn't a profitable market segment.
Personally, I think that if intel can provide a solution that transparently front-ends spinning disks with a long-life cache in front that provides most of the benefits of SSD with the cost & capacity characteristics of traditional storage, they'll have a very attractive offering for the "prosumer" segment that is willing to pay a bit more for performance but doesn't really have the knowledge/inclination to manage a variety of storage pools. Yeah, you can already buy one disk to boot off, and another disk to store big things, but most people don't want to bother--if you give them the option to pay a few bucks to skip the hassle, a lot of people would be interested. It's not a compelling product for me, but I can see the benefits. It also lets them make some money and sell some useful products even with the apparently never-ending memory shortages.