I think that eventually some programming tasks will become highly specialized, yes, and use custom and very specific languages depending on the field and the problem at hand and may end up with their own degree programs, etc. There's already hints of this sort of thing right now. It's very hard to transplant a programmer from (for example) web development to 3D game engine development - it has nothing to do with language, though. There's just a huge set of knowledge required for each that has very little overlap - even if the languages used happened to currently be the same in some cases.

It doesn't make sense to forever expend the effort required to force every problem into just a handful of languages' structures - even if it is theoretically possible to do so.

I think that things like OMeta (http://tinlizzie.org/ometa/) are an important piece and the other work being done by Viewpoints Research (http://www.viewpointsresearch.org) could help.