The Frontier series, for instance, featured a life-scale galaxy with seamless planet landing, each one entirely unique. It was released in 1993, and we're much better at making games like these now.
Here are some other games that will "never be finished":
- StarBound - http://playstarbound.com
- Rodina - http://elliptic-games.com/
- Elite: Dangerous - http://www.kickstarter.com/projects/1461411552/elite-dangero...
- Drifter - http://www.kickstarter.com/projects/celsiusgs/drifter-a-spac...
- Star Citizen - http://www.kickstarter.com/projects/cig/star-citizen
- Limit Theory - http://ltheory.com/
And there are still many more.
Btw here is an interesting interview with David Braben somewhat before the time of Frontier: Elite 2's release.
http://amr.abime.net/review_38271
http://amr.abime.net/review_38231
http://amr.abime.net/review_15452
Here is a reddit AMA from a year ago.
http://www.reddit.com/r/IAmA/comments/15od2s/i_am_david_brab...
There is also an impressive universe simulator called Space Engine and they are planning on adding gameplay to it, but it will probably take a long time before it's ready.
There is also Pioneer Space Sim that started as a Frontier: Elite 2 remake, which is also still WIP.
Also be sure to check out the Elite: Dangerous FAQ
http://elite-dangerous.wikia.com/wiki/Elite:_Dangerous_FAQ#W...
http://www.directorstalk.com/video-edison-executive-intervie...
i would like to see it, but i don't think its realistic (i don't believe its technically impossible - especially with that kind of resource, i just have little faith in the people involved by this point - which is a shame)