movies are too expensive at this point. 20€ / Blu in Germany vs 7€ for a DVD.
And as a gaming solution it is not established enough. Check mandatory installs. And if GTA IV fits on a DVD, everything fits on a DVD.
Next Gen, with more speed, no installs, cheaper movies, why not?
Wake me up when blu-rays are cheap as dvd's and readers are 8x at least.