The sad truth is that your precious cues will be worth nothing, or at least next to nothing compared to today.
In the US and Europe pool is dying out. The recruitment, even viewed optimistically is next to non-existing. Asia has a little more promise, but I don't think that will last for 25 years. Technology is racing ahead at an insane pace. It will be hard to compete with perfect vr and all the other things we have to look forward to. Besides, cue buyers are almost always old people who buy for nostalgic reasons. The kids today haven't grown up with custom cues, but rather Cuetecs and Predators. The young ones who will still be playing, 25 years from now will probably be poor or some kind of hipster(or future equivalent). The hipster ones may buy expensive cues, but not enough to justify insane prices. And the poor ones will probably use house cues or cheap carbon cues, that will probably be superior to glued wood at this time. There will probably be huge restrictions on rare woods (even woods today thought of as common) anyway, making the cues hard to move (meaning both sell and transport), and ivory....Well it will go the way of fur coats, and gorilla hand ash-trays. Won't be proper to own or even show people. It's the way the world today is trending.
There will always be a buyer for the masterpieces. But likely not the 5k cues from the also-rans of the cue world and certainly not the 3k sneaky petes. It will be a very divided market with the Boars and the Balabushkas on one side and the "you name the guy that people are trying to hype this week" on the other, with the latter fetching next to nothing. Who's going to buy a plain as dirt cue that is easily outperformed by a 50 dollar carbon one? I'm trying to think of a person, but I just can't imagine what that person would be like. Revo is allready taking over even if it's IMO flawed at present, but when this tech is mature, no wooden cue will stand a chance in the performance department.