I've done a bit of gliding at Booker a long time ago. I got hacked off with the uncertainty and all of the waiting around. For me to get back into gliding i think that you would need to move towards the "powered flying" model, where we'd have a slot (one hour, for example) dedicated time with an instructor - to cover how ever many launches that could.
I never really understood why that couldn't be put in place. Might increase the costs a bit with needing dedicated "glider fetcher/pushers" but these could be doing it in exchange for flying anyway.
Just my two centimes!