It's difficult to predict, because what started the collectibles decades ago was based on tone, quality, rareity and what the rock icons used. But in current times, collectibility is based on a number of additional factors. Reputations of certain guitars are being socially engineered on the net these days. And with so many builders and manufacturers, there is a lot of competition. This is far different than the circumstances circa 1980. The custom shop instruments from large manufacturers are in jeopardy because they are not the best builders of their own instruments. Also, there are tens of thousands of special issue, limited edition guitars from Gibson and Fender alone. Some of their values are based upon mere memorabilia mentality amongst specific age groups, and are subject to decline like any other temporary fad. Meanwhile much of the vintage market, which has a lot of cool guitars, has proven to be the most vulnerable, having the largest downturn in values at around 50%. High risk investments now. So, going forward it is difficult to say which guitars will take center stage in the future, because the criteria for establishing that kind status keeps changing every few years. And who knows what the 20 year olds now, will be thinking when they're 45 years old, and what criteria they will be using to spend big bucks on a certain guitar. They can change their minds several times between now and then.