You may be right, but I believe the desire to build a carpc will continue but for a smaller group. These new devices will eliminate the desire to build a pc for the people that don't really enjoy fabrication and manipulating technology. This is the group that usually struggles through the build / setup process and doesn't really "enjoy the ride" just to get the use of the end result product. If they could buy something that does 70% or 80% of what they want, they would buy OEM.
I still have to wonder how much liability the OE's are willing to assume to let us "play" while we are driving.
We also know that it is very rare to get an OE to offer true "high performance" electronics. They offer quality & durability but not high performance. What most OE's call a "audiophile system" is a joke compared to after market. They brand the stuff with Bose, Pioneer, Harmon Kardon, etc. but the system seldom if ever measures up to even a mediocre aftermarket system.
Time will tell though!!