The cynic in me is tempted to say that I'd expect uptake from the major theme vendors to be low (especially "premium" theme vendors). By using framework-specific hooks in their themes, they are essentially creating a lock-in, similar to the lock-in created by theme- and framework-specific shortcodes. Bad for customers, bad for the community, good for the theme vendors who want make it hard for customers to switch to themes by other theme vendors. If they were to start using these standardised theme hooks they reduce lock-in and potentially reduce recurring revenue.

I would love to be proved wrong and see some good uptake from theme vendors once a nice set of standardised hooks have been agreed on.

Also, for anyone looking for Doug's blog post, it's here: http://literalbarrage.org/blog/2012/06/29/wordpress-theme-hook-alliance/