After Avengers 4, Disney will release a UHD collection including all 22 MCU movies that made up the current Phases. What do you want to see in this collection?
For me, I want...
0. Everyone realizes that marvel movies color grading is muddy and ugly and purposeful washes out any true blacks. Everything looks great on my OLED 4K HDR TV except for MCU movies. This is why this video talking about this already has 3 Million Views... https://m.youtube.com/watch?v=hpWYtXtmEFQ
The one and only glorious exception to this is Guardians of Galaxy Vol. 2. I really hope that the inevitable three phase 4K UHD MCU collection fixes the color gradients so that they use true inky blacks and HDR colors. I would happily spend a $1000 for such a collection but I wont buy it at all if they dont fix this issue. The only reason I buy 4K UHD discs and bought an OLED is for inky blacks and HDR colors and the MCU doesnt utilize either in most of its films. I actually fell asleep the second time I was watching Captain Marvel because the colors (until the last 10 minutes) were so muted and washed out. The movie itself was great (hence why I went for a second viewing) but the color pallete until the final set piece was so dull and boring.
1. All UHD films need to be remastered from the original 12K film source down to 4K instead of upscaling the 2K digital prints. Since you're starting with a 12K film source, use a 16:9 aspect ratio since 16:9 (1.777:1) is a perfect midpoint between IMAX screens (1.43:1) and traditional film aspect ratios (1.85:1 or 2.35:1). If not 1.777, use at least the 1.85:1 film aspect ratio so that black bars are minimal and the tv screens are filled as much as possible.
2. Use high quality materials that are resistant to damage/dents for the container. Make the container a highly detailed Infinity Gauntlet replica as suggested by Jbmasta below and I'll pay $800 for it!
3. Don't bother including Blu Ray copies, instead include a digital 4K redemption code.
4. Charge $499 or less for the collection (you can charge more only if it comes in a highly detailed Infinity Gauntlet replica). And make the set enticing enough that atleast a million hardcore fans (just a small fraction of the number of people that watched and loved the Marvel films) would go pick it up. That would translate to $500-800 million dollars in profit for Disney, which is no small potatoes.
5. Fix as many continuity errors as possible, for example...
a. Edit the 8 years later caption in Spider Man Homecoming to instead say 6 years later.
b. Edit the caption in GOTG describing Gamora as the "Last Survivor of the Zehobari People" to instead say "Survivor of the Zehobari Massacre" since Thanos specifically tells us that the Zehobari people are now thriving after he massacred half their population.
c. Perhaps refer to Terrance Howard in Iron Man 1 as Ben Crandal (another close friend of Tony Stark) instead of Rhodes (or some other way to indicate that he is a different person than the one we see in all subsequent films).
d. Make the Collection in such a way that it would be easy for fans to pull out The Incredible Hulk from the collection (and maybe replace it with a disc for a future MCU movie) without it being apparent that the film is missing or was swapped out. Do this, because the Hulk movie wrecks continuity completely by using a different actor, was the crappiest movie in the MCU anyways, and is by no means essential to the story told through the MCU universe.
e. Fix any other continuity errors that fans have pointed out to Disney. Directors fix errors all the time in Director's Cuts, there's no reason Disney can't do the same to please the fans that will give them another $500-800 million dollars for this box set.