Well I have a theory but I doubt anyone is going to like it.

The problem with futurism is that eventually the future arrives and the predictions fall way short of reality. People get discouraged and "drop out" of the habit of believing the latest round of breakthroughs. This sub has gone through the full cycle at this point.

Mostly, it's a matter of the time it takes to commercially develop things. While that is going on, the headlines disappear and then if it manages to succeed, it is more interesting to the wall street types than the dreamers.

Another thing and maybe this is just me, is that I always objected to '-ology' as the best suffix. 'Futurism' is more sustainable because 'futurology' promises some sort of scientific rigor that will never happen on any sub.