Many-core overshoots needed performance for most uses. Hence the rise in sub-notebooks, iPhones, best-selling games console being by far the least powerful cons

Many-core overshoots needed performance for most uses. Hence the rise in sub-notebooks, iPhones, best-selling games console being by far the least powerful console (wii). + Concurrency is a unsolved problem. There are locks etc; there's smalltalk/Erlang pure-message passing and Web Services/SOA (it's concurrency). Concurrency is of academic interest, and niche apps (game engines; simulations; etc. = unsolved problem that is not needed... so far, anyway