This faster updates shyt may apply to phone nerds but the casual phone user either doesn't give a shyt or doesn't know the difference. The majority of people that will end up with the Nexus 4 will end up with it because its the latest Google phone out, and its cheaper. Their priority will not be because they get faster updates, the casual user doesn't know the difference anyway.
Go out and talk to some random google phone users and mention the names gingerbread, ice cream sandwich, jellybean etc... and see if they know wtf you are talking about or if they even know what version their own phone is on.