According to Dan, Siracusa will make appearances in the new show called "The Crossover" (http://5by5.tv/crossover), aleit irregularly. All is not lost for Hypercritical listeners.
The problem I foresee is that, by its very nature, The Crossover is intended to have on multiple hosts from other shows, and as such it's likely that he would have to share the episode with people other than Dan. While this could work for some things, I don't think it would work as well for subjects where he has deep, complex opinions or observations that he needs to impart without interruption. Still, I'll take what I can get.