I think that's been the case for just about every utilitarian 4x4 (CJs, FJs...) since the start of the SUV craze. They were all basically cheap transportation until the off-road "lifestyle" came into vogue.
I think that it's not going to be capability or design that ultimately prevents the coilers from having the long run of the Series rigs, but the economy/gas prices and the disposable world we live in today. The "classics" already have a niche that keeps them alive, but unfortunately many very capable rigs won't attain that status before they meet the crusher.
For the record, I've lusted after Discos myself (I blame Scott Brady), before deciding I can only afford so many rigs. My heart has always been with rigs that exude funk factor (or gear oil), so I gotta stick with the old iron. Still, I have to catch myself every time I see a Disco on Craigslist for next to nothing. "You mean I can be warm, dry, and still be on the trail? Sign me up!"
Maybe some day, if there are any left uncrushed...