I've never had a problem with DVD. Big ass televisions I have a problem with, because they aren't adequate at displaying them.
How many pixels are there IRL?
Anyway, as has already been said, I don't see enough of a difference between DVD - Blu-ray to really spark my interest. Though I'm certain my opinion would change if I owned a 70" wide screen. But then I'd have to sit proportionally farther away to make it look like 30" anyway.