When the volunteers are suddenly sent packing, no matter what the reason is, it is not too much to expect some form of communication. That communication could be as simple as a form letter thanking them profusely for their efforts on behalf of the community here and stating that admin has decided it's time for a new perspective
The ones I've seen "sent packing" didn't deserve a "thank you".
Like I said, the ones that resign voluntarily do receive one.
"Give 'em the old Razzle Dazzle.....razzle dazzle 'em"