IMO the more LCD pins that come out along with new tech, the older DMD pins will look and feel much more dated. In turn the older DMD games will be less desirable. BUT for this to happen we need new innovation as far as toys/tech are concerned and some really great hits. And in time yes DMD games will be what EM games are today IMO. With that being said your still going to get high prices with the DMD games bc just like EM games they will still be desired. Also the new pins will be over 10k for LE's.
Side note: Im 40 and been collection since I bought my first house in my early 20's. I would much rather have a STLE sitting in my house over a TAF or TOM. Yes they are great games but im past that era and like shiny new toys. Now to think is STLE had an LCD or AC/DC or any other recent hits had an LCD this would make the big DMD titles less desirable to many people. Prices will settle a bit with the DMD but in no way will the bottom fall out..... ever.