Charlie - First, congratulations on a excellent job. Most people that haven't done the job don't get to see all the steps involved, so you're providing us with a community service. Both my father and uncle built sail and power boats; I worked in a yard that specialized in wood boat repair and have built the Joel White Nutshell Pram so I'm familiar with what you're dealing with. (see Little Mike at Toys
I think that there are several things to consider regarding why more people don't undertake a restoration of this magnitude.
First, most people don't have the skills and haven't deconstructed the project, so they don't see that a restoration is a thousand little, easy jobs). It's not wood per se, but the how to get from Point A ( a wreck) to Point B (a gem) that is so daunting.
Second, most people want a boat to do the fun stuff. A surveyor told me in jest that the really smart owner is the one that buys a new boat, has fun and does not maintenance and then sells it when it's beat. We all know of a thousand owners that do nothing for themselves which brings me to the next part.
It is difficult to get a wood boat in good shape, so most older wood boat buyers are immediately getting into a project that they either can't pay for or don't have the skills to complete.
Fourth, I don't think that it's an either-or thing. There are advantages to glass and wood. IMO, glass is easier and may or may not be eternal. Since most people don't own their boat that long, longevity isn't really a concern.
Fifth, wood is far more expensive to construct and this is the single most significant reason IMO that people shy away from wood. Without the skills to work wood, an owner would need significant resources to restore a vessel such as Oh Joy. A new wood boat? Very expensive since each and every component must be manufactured in a one-off fashion. As for performance, wood doesn't have it unless it's a dinghy (a notable example is the GP-14 - MUCH better in wood than glass).
You are doing a magnificent job, but it's not for everyone. My father went from owning 3 successive glass boats to working nearly full time on the Gazela of Philadelphia. By that point in his life, he loved working on boats far more than sailing them. I suspect that you are gaining as much joy from Oh Joy right now as you will when she's done. Perhaps more. Keep up the great work and posts.