I think it's perhaps a bit strong to describe the current situation as a 'death', but the basic gist I completely agree with.
If I was coaching a young player now, I would strongly encourage them to have a two-hander. It simply offers far more stability and consistency, and makes it much more likely that you can develop a backhand that is a serious weapon. To play with a one-hander at the very highest level of tennis you need incredible skill, technique and strength, and if you can develop that with a one-hander, why not just go for a two-hander?
The main advantages of the one-hander, apart from aesthetics, are that it offers you a longer reach and more flexibility, but the supreme athleticism of players today has pretty much negated the first one, and you don't really need flexibility now as you can sit behind the baseline rallying on any surface.
Ironically, when I was in the LTA coaching system as a teenager, there was a general feeling that if you had a two-handed backhand that you should at least attempt to use a one-hander. This was not long after wooden racquets, and when the conditions were much quicker and many players came in all the time on every surface except on clay (and some came in all the time on clay).