"the supposed slump with 2010 being the dark ages of podcasting which somehow needed saving from decline"
The inability of any coherent narrative to form is evidence of a really big market. If its too big for any individual to see all of it, it must be pretty big.
For me 2010 is the early boom years of history podcasting. Mike Duncan's "The History of Rome" which was really the history of the roman empire not some sort of municipal thing. 2010 was a great year in podcasting, hardly a "slump".
Edited to add, from memory, in 2010 the Wormwood mystery-horror series was in its 3rd year, Lowell's solar clipper sci fi series had just finished its 4th installment with the 5th on the way, and I remember heavy self advertisement on the TWIT network about the new studio that would open in a couple months... for a dead media it was pretty exciting at the time.