It's possible to have a private shower and bedroom onboard an A380 flight, but you will pay dearly for the privilege.
There's room in the market for both extremes as well as in the middle. I doubt you'll get a buffet service on a round trip ticket that costs <$500 (trans-oceanic, at least) as it likely is not economical to offer that. That being said, there are airlines that are offering improved options even in Economy cabins... they just charge for it. An example is Air New Zealand's "Economy Skycouch" https://www.airnewzealand.com/economy-skycouch
So with the possibility that this design could save on fuel costs, maybe airlines will be able to sell upgraded experiences at prices that are today bare-bones. Time will tell.