if they're not careful, USB Flash memory (which is already up to 32GB for around $130 a piece...and there's one's with read rates of around 32MB/s and date-writes around 18-20 MB/s) will obliterate Blu-Ray (and all optical media) once and for all....no moving parts, far more convenient, harder to damage, and way cheaper equipment.
Seriously, what wouldn't be cool about having movies on SD cards or Flash drives? Not only that, but the player to play them would not only be small, but it'd likely require less cooling, less power, and be cheaper to make.
It probably won't happen by next year, but I'd say by 2010 to 2012, optical media will be a dying breed.
And thank goodness...one less mechanical thing in your PC.