Here's a load and a half of observations about this and similar hobbies... Shoot, ask for a two cent opinion and I'll give you your money's worth!
Across all these hobbies that revolve around "outdated" technology there is this same fear. Be it cameras, tube radios, old cars and motorcycles, or old computers even. The guys get old and wonder what will happen to the items they've enjoyed so well, spent so much time on and taken such good care of over the years. And yeah, there's a great push among all these hobbies to get kids (under 40 they consider usually) into wood wheeled cars, old cameras, hit and miss engines, whatever, mostly since they (understandably!) want their things to go to good hands, and often equally as important, convert the item into a bit of retirement money. Being in my early 20's I've had the old guys ask me personally how to get more kids interested. I just tell them my dad was always fixing things so I realized everything is fixable somehow and went from there. Of course most people aren't that way so that's a real dead end answer for them.
There are so many of these guys trying to sell. It seems many people have all they want and there simply aren't many prospective buyers. So what I foresee are a few young collectors with loads of stuff, probably received cheaply due to the great supply. Thing is that I have all the cameras I have a burning desire for, at least for the foreseeable future, and don't want to spend too much.
I can tell you if you were to sell them very cheaply I'd still buy about anything. I'd take excellent care of it also, and of course, would have trouble resisting using it. I'd think of the original purchaser and where the camera must have been over all these years and how proud he was of his new camera. I'd be even more proud to be the one to care for such a lovely artifact. For example, the other day I fixed a snowblower for this old fellow. I knew he had a Kodak that took 130 film. He was awfully down on his luck so I said I'd be happy to take the camera as payment (for a couple hours work) but it was his dad's and didn't want to part with it. We settled on some metric wrenches as payment. I came to get those a couple days later and handed me two bags, one with the camera and one with some wrenches. He realized it wouldn't end up in a pawn shop or the trash and would be taken good care of, especially since I liked it to the point of remembering it after a couple years.
Now there is such a thing I noticed about hobbyists. They tend to be interested in about anything remotely similar to their hobby. If you can find somebody who likes woodworking and show them a camera with beautiful woodwork, or somebody who likes fine mechanisms and show them a complicated mechanical camera, or anything like that, their interest will be piqued. Of course they might just like refinishing it or clicking the shutter by the light of their nightstand lamp late at night, but they may be inclined to use it one day also. It's kind of hit or miss.
So I guess one way or the other the future is bright for the relatively few young collectors. Maybe in ten or twenty years I'll be able to have a barn full of Maxwells and Overlands and a basement full of old Indians, Excelsiors and metalworking machines. Hardly anybody could so much as make use of a working one. How about I daily drive a early 20's Dodge Brothers, carefully and respectably. Why not?
I don't find much merit in the repository idea. It would just put together the dozen collections that are contributed and still have the same problem of what to do with it. Difference is it would turn from a dozen little issues for individuals to decide on into one big, expensive, collectively indecisive and emotionally charged issue. I've had simple cameras sitting around hoping I could convince somebody, anybody to give them a try but I can't get somebody to so much as think about it. I don't think I've seen anybody jump toward the few young folks who are known to prowl this very website offering equipment as a gift. Seems there are a couple young fellows in this very thread who would be good caretakers and appreciators and users, and another comes immediately to mind who is a regular poster, and there's certainly more around. Of course Thailand is a ways off, but for those in the lower forty-eight...
How about this -- Set up a form where you can post a camera to give away or sell cheaply or whatever. Whoever writes the most convincing essay to the thread author gets it. Make it like a scholarship application. If the OP is unhappy with the responses he can just keep it.
I hate to say it, but the best way to get money out of it would probably be good old eBay. They wouldn't buy it just to throw it away. Time to sell is now. Prices might be low but it could be simply a no-sale before long. Of course they might part it out to fix their current camera or just use it for decoration. Who knows.
But above all, if you've got anything nice you can guarantee somebody will take good care of it, somewhere.
Brian