Looks like Rand's ambition takes precedence over Ron's principles. He likely would've made a 3rd party run in 2012 if not for Rand as well.
It is much more strategic for the liberty movement to go with Rand in 2016. Keep in mind, the Ron Paul generation is entering politics. Many young political staffers, and future State Party chairs and committee members are being born. The GOP will be the party of Paulism in the near future, once we expunge the Tea Party-neoconservative elements.
In the end, this is the right decision, though I still fantasize about a Paul/Johnson run in 2012.