I hear that same sentiment, "I bet it won't be around in 20 years like my good old such-and-such," all the time with many different things.
Someone said that about your 1997 CTD Ram. It's got a computer or two in it, not to mention it probably has just about every luxury doodad you could get in 1997, because $40K bought you a LOT of truck in 1997. Bet the power windows still work.
The reality is that MOST 1997 trucks are in the scrapyard. Yours is an exception as it was well cared for and has seen limited use over the years. There will be just as many 2016 trucks still on the road in 2036, if not more due to how much they cost!