This is opinion but I think the problems you can express well with a language like prolog are quite special. The problems programmers need to solve every day are better expressed by a language that's closer to human languages. How would you write in prolog that you want it to serve a website? Of course this is possible but probably not in an idiomatic way. Furthermore like with functional languages the performance of the program is harder to predict.
This is the central problem, I think. There are problems which are traditionally solved using different approach, not a Prolog-like, and we're mostly comfortable with this approach unlike with others.
A successful general-purpose language has to solve all - or at least all important - problems sufficiently well. In communications to each other we use natural languages, which conveniently allow to omit hard parts if we wish so, so they are rather easily bendable for everything. With precise languages we so far have to either hop paradigms or use clunky detailing. We either need to look to everything through a Prolog (or other language) lens or keep using a variety of tools.
