neither useless nor compelling (Score 1)

The trick to taking advantage of future processors like the ones architecture futurists such as David Patterson envisions when he talks about "manycore" chips is to make parallel programming easy. Making the programmer puzzle out the parallelism for himself isn't the way to do that. We already know pre-emptive threading is too difficult for most; putting pervasively parallel programming (PPP) in human hands would be even worse. A proper approach to PPP involves inventing a new language, not adding warts to C++, which already has more than enough of its own, thank you very much.