Sure, there are lots of reasons beyond Homo Economicus thinking for why we work the way we do. Laws, cultural expectations, and so on. I just don't see results-based work displacing the current norms broadly enough to make a difference, and if it does in fact result in better productivity I expect that to be eaten by competition/profit rather than going to workers as free time, in the long (medium, even) run, absent some pretty massive shifts in culture, especially with international competition in the mix.