Personally I find realMyst: Masterpiece Edition to be kind of a bittersweet experience. While its a lot more user friendly and graphically clean than Myst, it lacks in the aesthetics and charm of Myst which really had a sumptuous, painterly flavour.
For instance, Achenar's Cache in Myst is dark, moody, full of shadow and contrast like a baroque oil painting. The severed head when revealed is perfectly enshrouded in the shadow of the wooden box it rests in. The head is depicted with the detail and richness one might find in a memento mori with the leathery skin rotting away, revealing the stained teeth underneath.
You get none of that in rmme. Instead, this whole environment is tainted by bright lighting than ruins the shadow play of the initial game. The head looks like a greasy potato and the butcher's knife has strong glare in its reflection.
What I'm saying is, judging by what I've seen of Starry Expanse, realMyst or rather Myst needs to be given the aesthetic treatment that it deserves that preserves its splendour and mystery. rmme was cobbled together using the extremely dated realMyst (None of those models are updated from their 1999 versions) with a slew of effects and texture updates (some which look great, others not so much). Also bear in mind rmme was done BEFORE Cyan hired their current stellar art team.
I'd be down for an Unreal Myst treatment IF it stayed true to Myst's 1993 aesthetic and ambience which I find rmme sorely lacks. I use sweetfx and gmefx in rmme to try to replicate the pre-rendered look to varying degrees of success.
The question is who will do it? Cyan? Not until they have more dough, and as for SE, they're part-time volunteers who are working ultra hard on Riven right now which has NO 3d version and is in my mind a much better and richer game than Myst which could use some free publicity. Riven has affected me a lot more than Myst, and this is true for many Myst fans. Riven is a masterful classic that really hasn't been valued as much in the games industry compared to Myst. So in that sense I think Riven is a priority.
Ideally I'd like BOTH games done justice in UE4 with attention to feel, aesthetics and ambience that their pre-rendered versions excelled at because the longer we go, the more it is that younger generations will be turned off by the pre-rendered, slideshow style movement. I tried getting my ex who was born in 95 into Myst and he just couldn't navigate the slideshow interface, as he had only ever played 3d games.