I think a bit shorter than decades but I see your point. To me gen AI is at the "Netscape Navigator/AOL" stage. It's now entering public consciousness and becoming the new "thing." Before Netscape and MS biting them with Explorer, the Internet was a bunch of text based academia/underground/nerd/niche pages and sites. Netscape made it visually appealing with colors and graphics. Then AOL made it so that every household in America could get online.
Think of all the innovation and the speed at which it became mass adopted we've seen in our lifetime. I first got online at school in the mid 90's, looking up Wu Tang lyrics and shyt. It was this secret underground world at the time. When I got into AOL chat rooms hollering at broads, the vibe was "we can't tell anyone where we met, we have to make up a story." I don't know how it started but there was definitely a hard no stance to admitting you met someone online. Everyone was doing it, but it was on some sneak shyt because "only serial killers and weirdos and basement dwellers meet online."
In 25 years we went from CDs/tapes to mp3s to streaming. VHS to DVD to streaming. "Serial killers and weirdos" to Myspace to Tinder. So on and so on. Where will AI be in 25 years?