Some of this comes down to perception over human faculty. I'm in the business, and I look for aberrations it's what my mind does, most people wouldn't notice a thing. I used to strive for utter perfection, and I still try to produce the best results I can (believe me, you guy's want to hear some of the bands I've been working with lately...errr no you really don't)
But Blu-ray, as in true Blu ray as a fully noticeable, WOW that looks better factor, you need really really high spec kit.
And who, as in most people who view and listen is likely to fork out in excess of £15000.00 to watch a movie or listen to some music?
Nobody, It's just hype, trust me.