This swarm isn't anwhere near the Mammoth Lakes caldera really; several years ago the Caldera itself had dozens of swarms more intense than this swarm.
Also quake swarms can happen due to purely tectonic (non-volcanic) causes.
Calderas can easily go thousands of years with quake swarms, inflating/deflating, and no eruption.
Great to know, thanks. At least I can go back and ski Mammoth again someday :)