Many are changing over to digital. And professional slide shows are now mostly digital also. Look on Ebay and see all the nice pro-quality slide projection equipment selling dirt cheap. Just the other day I saw a pair of S-AV 2000 projectors with lenses and desolve/sync unit with a BIN of $200. Needless to say I didn't have $200 available or I would now own them (sad shake of the head).
Dr E D F Williams wrote:
I thought 70 mm had displaced 35 mm to a large extent.
-- graywolf http://graywolfphoto.com
"You might as well accept people as they are, you are not going to be able to change them anyway."

