They're pretty far down my list.
Personally, I'm more looking for channels that has programming I have Series Links set up for (CW DNS, TV Land, BBCA, DIY, Cooking), and than programming that I watch from time to time in SD (LMN, Ion, etc.).
If the *plex channels are added, and they are in the HD Extra package, I'll tune in from time to time, but if they end up in Choice Ultimate or the Starz package, they won't mean a thing to me personally.
After doctor who, the only SD series I watch are Hot in Cleveland et al.