Nope. My carpc plays HD video, contains my entire music collection, can support multiple screens, plays games, surfs the web, and supports hardware upgrades as I see fit. Video, audio, chipset, and other hardware drivers are always being improved and released by the manufacturers. It is permanently installed in the trunk of my car, alongside my amplifier. It blends perfectly with my car audio system. It runs Windows and is constantly updated by Microsoft. It is fully wireless, plus has wired ethernet for faster speeds when transferring large files. I'm not ham-stringed by lousy cell phone manufacturers refusing to upgrade the OS, nor by the complete lack of in-car entertainment applications.
I think a new generation of head units will lure some people away from the carpc hobby market, but people that truly love building, tweaking, and maintaining a carpc will continue to do so - not because it is easy, but because it's fun and is unique in a sea of run of the mill audio and video solutions available for an automobile.