I understand your objective, but it could actually backfire. If people don't buy the streaming or download versions, the studios could think that no one is interested in UHD and as such, not invest in disc versions and possibly not even bother with UHD streaming versions.
I will pay $30 for a 4K UHD BD movie but there is no way I am going to pay money for a digital version that I have to download or rely on a internet connection to watch it. I see no value in a movie that is not on a disc and no way I would pay $30 for a digital version, no way!
It depends on the movie for me. If it's a new film that is releasing on 4K/UHD then I might buy it less than $25.00. For most catalog titles that I already own on BD less than $20.00 is my target price.I will not even pay $30 for a UHD disc -- my price point is less than $20 (and most of my purchases have been less than $15 per film). The pricing for UHD streaming content is ridiculous right now. Vudu is charging $10 just to rent a UHD version of a film, which I think is insane for a rental. I only have a few UHD titles in my UV library, and they are from codes I redeemed from UHD discs. I haven't actually watched any of the titles via streaming, as it makes no sense to watch a stream of something I have on disc.
It depends on the movie for me. If it's a new film that is releasing on 4K/UHD then I might buy it less than $25.00. For most catalog titles that I already own on BD less than $20.00 is my target price.
As to making no sense to watch a stream of something you may have on disc, it depends on certain circumstances for me. I keep my disc library in another room stored in book cases with thousands of discs. Sometimes, I'm just lazy and/or it's simpler to watch Vudu then to actual go and get the disc. For a first timing viewing, then I'll probably watch the disc, but if it's something I just got in the mood to watch, I might watch a stream of it. Again, it depends on how lazy I am that particular day.
I haven't actually watched any of the titles via streaming, as it makes no sense to watch a stream of something I have on disc.
It makes a ton of sense while traveling. Heck, last week I spent a full day polishing and waxing my car in the garage and I had movies playing on my iPad just for something to listen to. I have grown to value the ability to stream greatly.
If you think about it, music has always been this way - you do serious listening through a main sound system but there's also value in listening while out for a run or while driving the car. Really all streaming is is movies having now caught up to that kind of usage.