I think it will be with us, for the reasons mentioned above. Also don't forget due to the huge diameters used today for bars and stems things have stiffened up on the front end which in theory leads to more accurate handling and power transfer when standing.
Personally, I miss my quill ITT stem on my '94 Trek 5500 frameset custom built w/full Campy record. It was great to adjust bar height easily for time trials or longer rides. And there was just something elegant about that campy record headset, one of the best of a dying threaded breed as mt. bike parts took over later in the decade.