Yeah, I agree with Yoozer... digital is digital, 1s and 0s, they are replicable - see the 99.9% correct replicas of Korg M1, Roland D-50, Wavestation etc
As usual, the high end components such as the DAs, internal analog path, VCOs etc. are the difficult ones to model, so I would suspect the known "good ones" that are already expensive today (high end Lexicons, AMS, EMT, Eventide etc.) will be the ones going up in price. I really don't think something cheapo as - say - an SPX90 - will get much traction in the vintage market of tomorrow.... but who knows.
Also, part of the whole vintage craze is nostalgia for the older generations, and curiosity for the newer generations, it doesn't have to do with the sound too much... I mean, how much is a digital hall reverb from 1985 different from a digital reverb from 2013 - bar the obvious differences in the algorithm, filter settings, quality of converters, sampling rates etc? Simulated reverb is simulated reverb. Actually, some high-end reverb from 1985 sounds more realistic than some low-end reverb from today...