I'm rediscovering my classic space legos now that my boys have reached the age where they can start using standard lego bricks and I've been disappointed with the fact that so many classic space sets fail to meet the threshold to be made by Lego. Having read through this thread, it seems to me that maybe a better approach than lego ideas would be developing a independent website that had a well curated selection of MOC's organized by theme (neoclassic space) with set piece lists that can be bought from Bricklink. I'm still new to rediscovering lego, but what impresses me now is that you can basically create your own sets with instructions independent of Lego with the MOC's on Bricklink and Rebrickable. It's expensive, but a lot of that has to do with the piece counts of the MOC sets, not the availability of special pieces no longer produced by Lego.
While I may lament Lego for not wanting to create new space themes, I also feel like the vast majority of space color themes were produced in those old sets i.e Blacktron, M-tron, Futuron, Ice Planet, ect. Themed sets were the inevitable outcome after the sets of the 1990's, since almost every color scheme was utilized by Lego in their in-house themes.
I've been drumming up support from my boys to create our own space theme, since you can basically create your own minfigs and print stickers. Its not that much more cumbersome. Most space themes were about 10 sets - 4 spaceships, micro, small, medium & large, a couple of ground vehicles, a base and some odd ball sets.
Anyone else just decided to create their own space theme?