As much as I have a soft spot for alternative cpu archs, ARM has less and less of a place outside of cellphones and embedded sectors
I doubt ARM worries about that, though - analysts expects around 5 billion ARM cores to be shipped this year (fewer CPU's, since more and more of the designs are dual core).
While they may seem to have been pushed out of places like the desktop, keep in mind that the desktop and laptops make up a smaller and smaller percentage of the computing market.
Cellphones, tablets and embedded devices is where the volume is, and both cellphones and tablets are eating their way up into spaces where laptops and desktops ruled before. Look at the newly announced Motorola Atrix - a phone that docs with a laptop "shell", as well as a number of phones that now support bluetooth keyboards.
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.
EDIT: Oh, yes, forgot to mention: The Atrix *does* use the Nvidia Tegra