Like everything, it depends on the problem. There are problems which needs parallelism but cannot use many of the languages mentioned by the OP. Eg: Realtime Multi-channel video encoding. Most of such systems use custom processors. Unless massively multicore mesh architecture (like Tilera TILE64) become common place, we are stuck with using such custom processors and that would mean using plain old C. Once mesh based multicore becomes cheaper and commodity, we will see use of other languages in such problem spaces.