Not necessarily a bad thing...just a cult thing.
Actually most commercial movies are shot in 35mm or other film, which supports a higher revolution than even Blu Ray provides....so your point is a non-issue. Any movie can be mastered in HD as long as the original resolution of the filmed media supports 1080p or higher.
Context, man, context.
I was responding to Stuart who was/is afraid that the studios will cheap-out on some of their catalog releases and use the crappy DVD digital master (upscaled in some cases) instead of making a new HD master from the original source.
I'm very well aware that film resolution is a bit over 4k, vs 1k for a finalized Blu-Ray (1920x1080). Most Blu-Ray masters are 4k, with some being 2k (and looking bad enough that they are being redone, as The Fifth Element was), and a fraction being 8k. DVD masters were mostly 1k. Technically, that "should be enough" for HD, or at least, that's what the studios were hoping when they made them 7-8 years ago, but in reality, it isn't. Now, they're having to go back and spend more money to make HD masters at 4k at least.
None of us wants the studios trying to pawn off 1k DVD masters as valid Blu-Ray masters.