No, 26 ain’t dead, you just can’t buy it anymore!
Most of the people I know are still on 26, a few have 29ers and that’s it. A group of us go to the Alps every year and all were on 26, no one even talked about wheel sizes and no one’s likely to change bikes soon, we all just got on with enjoying them.
Also on local club ride recently, I thought I’d take my 29er so I’d fit in with all the young cool dudes and their fast xc type bikes. Out of about 12 only 2 were on a 29er, everyone else 26.
It’ll be a good few years before I buy a new bike now, I have plenty of 26in tyres, forks, frames that work perfectly to keep me going for ages