As a result, we might very well see the bottom falling out of the desktop and laptop market very soon, with both of them relegated to the high end of the market, with smart phones and tablets becoming the only computers for a lot of people. And that sector is overwhelmingly ARM dominated, with 90%+ of the cores shipped.
Doubtful, what is being shown is that whilst traditional big box stuff isn't selling as well, all in ones, so called life style PCs are doing rather well for a variety of reasons. Maybe this will change, but I think Atom will certainly make up a large proportion of the market. It's not particularly fast, but it's fast enough for most people, especially in it's dualcore encarnation.
As for your figures about the number of cores sold, only a tiny proportion of them will be anything other than low end.
EDIT: Oh, yes, forgot to mention: The Atrix *does* use the Nvidia Tegra
Looking through El Reg, it seems a couple of the tablets being displayed at CES are going to use it, so I spoke too soon. However, Tegra has been around for what, 3 years now?
Still waiting for the software to catch up though.