From the perspective of the overall world of photography, I'm sorry to see it go, but I don't find it surprising. My own slide shooting started tapering off 30 years ago.
My most recent attempts at transparencies have run into "local" processing taking two weeks or more, and in some cases, evidence of less than careful handling, and I don't use enough to even consider doing it myself. I do have a few rolls of Provia here yet, but they aren't being consumed very rapidly.
"The only thing constant is change."
I don't know who you use for E6 processing, but I've been satisfied with Colourworks in Wilmington.