Android may work for some, but it's not a very good solution for everyone. How is it in terms of startup/shutdown? It can't run all the time like a phone does. How is it's USB support? I don't want to run out and buy bluetooth versions of all the neat USB hardware I already have. What about media support? FLAC, AAC, MP3, M4A, WMA... I can't even get a standard MPEG file to play on my Moto Droid... What about video? MKV sucks on the android platform, alot of my AVIs won't play either. Will it support my USB backup camera? Can I plug a thumb drive into it that's NTFS formatted and transfer to my CarPC running android? What about my iPod? Can it allow me to use my carPC as a bluetooth gateway to my phone? Last I checked those neat BT profiles weren't implemented yet. What all hardware does it support? The Android-x86 team are using eeePCs to dev on, which means that most atom hardware based on intel chipsets will maybe work. What about us Ion platform users? What about us nForce users? Via CPU users? I mean, talk about reinventing the wheel... again.
Also, the market takes a bit of tweaking to get working properly in the x86 version, and afaik it's against the terms of service. The Android-x86 team isn't allowed to include it in their distro anymore.
Bottom line, to reiterate, is it may be the perfect solution for some, but won't be for the masses.
Just like Kev and his crappy LinuxICE.