As one who unfortunately doesn't have a 20 GHz octocore CPU with 8 TB system RAM and 256 GB VRAM on my overclocked and liquid nitrogen cooled quadro-linked graphics accelerator, nor expect to have such a system available anytime soon, I'm thrilled that DW isn't full 3D.
There are a few things that could be done with 2D world rendered in 3D but frankly, I think the graphics in general are perfectly fine. Then again, I'm still playing things like Red Alert, Civ 2, Alpha Centauri, and even Diablo 1, so I guess one might argue that I'm not very demanding as far as graphics are concerned, as long as the graphics do their job of conveying the information I need without breaking my eyes.
Obviously the user interface could be a bit better, but that has very little to do with 3D and everything to do with basic user interface design concepts having changed slightly over the last few decades. And to be fair, I doubt user interface design was a big priority at any stage of development. As long as the user interface was usable, other things presumably had higher priority. Fixing bugs, adding features, fixing more bugs, adding more features, AI optimization, performance optimization, bugs, features, and so on. Those other stages never ended so there probably wasn't ever time to revisit the user interface and take it to the next level. Which is a shame, because it's honestly one of the bigger drags in the game.
Why can't I see what ancient ruins I haven't explored on the galaxy map? What is the use of having an entire galaxy map overlay that shows me nothing except how many systems I've visited? Why do I have to control the component order by the order they're added in? Why can't I decide for myself which components I want shown by default in the window instead of having to rely on game's idea of "most recent" or "all"? Why can't I modify the research queue without having to untag and retag all the techs I want researched? Why are garrison fleets under AI control showing up as idle ships? Why isn't there a "sleep" or "observe this position for 1 year" order in case you'd like your long range scanner exploration ships to do active surveillance of foreign space? Why isn't there a "crap, I clicked the wrong science station, please don't take a six month vacation, PLEASE!!!" option for when you accidentally assign one of your better scientists to that fancy new space station you discovered on the other side of space? Why can't I select what races I want on my planet? And why is it that the ship graphics selection is an uncategorized drop-down with a few hundred elements that is practically impossible to navigate? And so on, and so forth.
Anyway, I guess this is my way of saying that the graphics feature I'd really, really prefer to see in the future for DW is actually something as "simple" as a user interface overhaul. Pretty much everything else is awesome. DW is by far the most expensive game I've ever bought and I don't regret it at all. But the user interface... I've seen worse, don't get me wrong, and at least it's made for PC, unlike some triple-A titles I don't care to mention, but it does let the rest of the game down.