We used live-view for remote frozens in residency -- one outlying orthopedic center that liked to ask for neutrophil hunts, and after hours transplant frozens, as I recall.
I've seen CDs of slide scans go around for 2nd opinion/consult type cases in FP; occasionally we come across slides of such potential importance that the originating office refuses to let the original slide leave the office, so any consultant has to come to them. I believe some offices don't let -any- slides leave them as a matter of procedure, barring a court order (though most seem to review and release recuts, as far as I can tell). So unless it can be scanned or images taken of relevant areas or the cost footed to get the consultant to the other office or a court order arranged -- all of which have their own sets of fairly obvious arguments accompanying them -- then it just wouldn't get reviewed. While hardly any offices can whole slide scan, most have some sort of still image capability.