I have no problem with those who prefer a downlaod, and the convenience thereof. But you're really kidding yourself by claiming the quality is on a par with Blu-ray. Beyond the easily discernible naked eye superior picture, what about the sound? An iTunes download does not come with DTS HD Master Audio/Dolby True HD etc - for some of us with premium sound systems this is VERY important.
If I want a copy on my iPad, I can rip the BD and create my own digital version in any format (DRM free) at a quality/file size ratio of my own choosing. With my TV Star Trek box sets, I do rip the episodes completely uncompresed for playback on media players. If DS9/VOY are eventually released on BD, total storage space for ALL Trek, including the movies, will be around 6TB. All this, and I still have the BD's I can take to a mate's house - and fall back on at any time.