I thought that the recent sales of the Nexus {4,7,10} showed exactly the opposite. There is still the possibility that the supply of those devices has been short on purpose, but I haven't seen anything reliable to back that claim up.

Most people want Vanilla devices and we techies want everybody else to have Vanilla Android devices because it reduces the amount of fragmentation we have to deal with when building things. Additionally I have literally never seen OEM additions in mobile or desktop computing make something better for the end-user and everybody should just get over with it.