I agree, however network infrastructure is constantly improving across the world as a natural byproduct of the growth in the number of Internet-based services being provided to consumers and businesses. Nobody said it's going to happen overnight, just as nobody expects 4K adoption to become widespread overnight. But it needs to happen, and not just for 4K video, but for a range of services that - like it or not - are moving "to the cloud".
4K is a premium product, so I assume the studios are aiming it at people who can afford to access fast Internet. If you don't have the bandwidth to stream or download 4K, then current DVD, Blu-ray and 720p or 1080p digital media should serve. This is again why I don't see any logic in 4K physical media in the long term. If 2K Blu-ray struggles to rise above being a niche, and studios are only grudgingly dishing out catalog titles on Blu, why on Earth would they bother with catalog releases on an even more niche product?
To help people conceptualize how 4K delivery might actually work, let's consider that:
Netflix is already moving to enable 4K streaming. The Netflix CEO says in this article that "As an overall system load, it will grow quite slowly and steadily, giving people lots of time to build the infrastructure."
YouTube has already moved to provide a (highly compressed) 2160p 4K option for its videos. This article has more details, including the fact that due to partnership deals (19 hardware partners including ARM, Intel, Broadcom, Marvell as well as Samsung, Sharp and Toshiba), TVs which support this high-compression VP9 codec will be released starting in 2015.
Sony has already released a 4K media player to which you directly download 4K movies. It can download movies fom the Video Unlimited 4K service, up to around 45 full length features can be stored on its 2TB internal drive, and you can add external storage to hold more movies.
The Playstation 4 can download 4K movies at 100GB a piece.
Amazon has just announced that it has entered into a 4K streaming deal with several partners - Samsung, Warners and Lionsgate.
I would be genuinely interested to hear from anyone how 4K Blu-ray could viably compete with these options, keeping in mind that studios are steadily abandoning 2K Blu-ray as it is, and leaving most catalog releases to boutique providers.
If everything you are saying is true, 4K Blu would have never even gotten off a white paper. It would have been shot down before it even got to where it's at. I think the market can support all forms because there is a big enough videophile group who prefers physical media. I see it on many forums I visit.
There is also no evidence studios are dumping or not wanting to support Blu-ray. We've seen some GREAT catalog titles come out in the last year. You're spreading pure FUD.
It sounds like you don't like physical media and prefer streaming/downloading, and that's fine.
However, streaming/downloading will NEVER match physical media for maximum PQ...especially at 4K. I believe there is a big enough market that realizes this.
And the bandwidth/infrastructure issue is a far bigger problem in the U.S. than you realize.