Feel free to divide it with 8 to get bytes instead of bits. I just hate how they use bits in everywhere to confuse end losers. :)

@alephnull

Thats one reason why I prefer mini laptops. Laptops just aren't for gaming and with those mini laptops you can do just about everything you need from laptop.

For films, never. For backup maybe in a few years but cloud services and RAID backup do the trick nicely as well.

@OP
BD read-only has a reduced usefulness on PC's, so I'll consider BD-R/RE
If BD-R drives get fast under $100 their mass adoption as RW optical units on PC's can begin, to become the standard they must get even cheaper.
The first stage of adoption, mass, but still minority compared to DVD-R, when price falls under $100, can begin even before 2012, late 2010 given the current price, but then another two years, roughly, will have to pass before they drop under $50 and become commodities, so for that your 2012 estimate looks quite correct to me.
@BengaBenga:
I agree about movies: as even the biggest PC monitors are smaller than big TV's and best used close, while watching a movie is a typical relaxing activity that's more relaxing not staying too close to the screen, I don't see their main use on PC's for watching movies, more for storage and games.
As for flash cards, their price per GB is higher than BD discs' one, they'll be more used for faster on-the-fly copies and non permanent ones, also because rewritable discs are usually slower and more expensive than write-once ones, while write-once discs will be used for cheap permanent copies.

Shit, I read it as bytes, the b/B format always pissed me off.

To buy blu-ray for my PC, it would have to be a burner and cost $20 like my recent purchase of a new DVD burner was.

Not from apple anytime soon

Steve has said its a no go unless blue ray spec settles down (which it has not) and sales boost majorly (which they have not. only new releases are seeing even 2X% sales figures)... also dont forget apple sits on the blueray board and they said this

from a CNN interview

"I asked Jobs whether this meant the format war between Blu-ray and HD-DVD was over, with Apple the big winner. Clearly, he said, Blu-ray won, but in the new world order of instant online movie rentals, in HD, no one will care about what format is where.  Funny how fast tech can move."

http://www.cnbc.com/id/22673034

from steve at a keynote

"Blu-ray is just a bag of hurt. It's great to watch the movies, but the licensing of the tech is so complex, we're waiting till things settle down and Blu-ray takes off in the marketplace." Phil chimed in with "We have the best HD movie and TV options in iTunes." Damn. As if that weren't enough to make Mac-lovin' home theater junkies cringe, Steve also commented (when asked about the dearth of HDMI in his introductions) that HDMI was "limited in resolution," and Philip Schiller elaborated by saying that "for typical computer use, DisplayPort is the connector of the future."

http://www.engadget.com/2008/10/14/steve-jobs-calls-blu-ray-a-bag-of-hurt/

give it about 2 years

PC gaming will always be on DVD with download option.

It doesn't have to.

As soon as the bandwith is good enough for HD video streaming, cloud computing will replace the current local computing format.

You won't have to store the games/films/programs, you don't have to use processing power to use them, just join to a server that does it, and sends you the on-screen result like a video.

I don't know when will it happen, but probably sooner than the years required for Blu-ray to become  standard.

I am big on cloud computing esp for campaign docs and communication as I have exp w/ this.  However, the cloud would have to be protected with to prevent mass loss due to some Chinese DOD hacker or slick kid trying to get his kicks.