I don't think BR is killer for PS3 in the sense that a ton of people will buy it just for that. Sure, maybe some will, but I tend to doubt it would be a lot.
Where I think it really helps is Joe and Jane parents getting ready to plop down for a console for Jr. They aren't going to play that console as a console, but what they do see is an addon that means "the whole family" gets to enjoy cutting edge technology too, and at relatively moderate add-on cost and risk if that format war goes against them in the long-run. I think that is relatively powerful, at least in the first year. How powerful it is in years 2-5 depends on how well BR does in the larger battle.
Where I think it really helps is Joe and Jane parents getting ready to plop down for a console for Jr. They aren't going to play that console as a console, but what they do see is an addon that means "the whole family" gets to enjoy cutting edge technology too, and at relatively moderate add-on cost and risk if that format war goes against them in the long-run. I think that is relatively powerful, at least in the first year. How powerful it is in years 2-5 depends on how well BR does in the larger battle.