Yes this is important, as it's a pre-requisite for timely security patches. But how much interest is there?
For regular Android, because the handset vendors can do arbitrary customization, they would be the one to manage the upgrades. And I'm not sure they're really willing to do that... It's cost for them, they don't care much. I only see them moving toward this forced by a big security issue, still to come. But with phone based payment coming let's say it's a fertile ground...
A community distro like Cyanogen would be a much better place to do that. But then I'm not sure Google would care making the effort just for them.
Maybe it's just me being pessimistic, but I don't expect much progress there before a big security problem force the industry to move. But we'll get there.