BD not going to last as a format? What?
Yes, you truly have to watch them on a large TV. My sister has a small, 720p TV and says that she can't see the difference. On my 40" 1080p it's very noticeable. What's been the best to watch are the movies that either have been restored (The Godfather--yes, it's patchy in spots but some scenes are freaking gorgeous) have a great transfer (CE3K; plus the print was in great condition) or movies that were filmed hi-def in the first place.
Remember, BDs hold more information so less compression...
I A/B'ed Blade Runner and it's definitely noticeable. I'm anxious to check out Taxi Driver esp. with the 4K transfer.