Like any species, they want their children to survive and for their species not to go extinct. Other than that, they could be the nicest folks in the galaxy. Wouldn't that be freaky?
Out of all the various sci-fi series franchises, Stargate has the most potential IMHO. It's one of the few that also has a strong Earth connection relative to our time here (not too far in the future). That helps with relating to it.
I'd like to see a new version called Stargate: Terra. Basically, it's set a little bit further in the future, where the signs of our reckless industrial activities have taken its toll on the planet. I know... "Terra Nova". Well, it's a similar idea, but in a different way. Basically the planet has slipped past the point of natural recovery within a reasonable period of time (e.g. 2-3 human generations). The glaciers have melted, the ecosystems have collapsed, and life in the oceans has retreated deeper than we can reach for use as food. The Earth isn't "dead"... it has simply become uncomfortable for humans to inhabit.
Stargate command has gotten some alien assistance with regards to the matter, and it has been determined that drastic "terra forming" type work is needed to bring the planet back to its state prior to the industrial age. To do this, the human population cannot be present. And so... not only is the Stargate technology finally announced to the public, but everyone must make preparations to leave (this will take a handful of episodes). A number of habitable worlds have been chosen for people to go to. And as it so happens, world leaders manage to agree that they will go as either nations or small regional groups of nations. Various technologies will be used to keep all separated Earth nations in touch, for things like status updates, physical trade, and tourism. Of course... it would be a tricky thing to handle. How do you let everyone know what's going on without collapsing financial markets in a panic? How will financial markets exist off world? Very complicated... but I believe there's some way it can be written so that it's believable enough.
Anyway, the whole premise is that Earth will be vacated for restoration. And there will be struggles all over the place... settling uninhabited worlds or co-habitation with alien humanoid beings, terra forming struggles back on Earth, hostile aliens encroaching to take over, ancient technologies sought to deal with various issues, rogue humans escaping and leaping around Stargate sites causing havoc, some aliens that have "had enough" of human encroachment, etc...
At some point, Destiny would make a return at a critical point, and once again ancient technology will help save us. Whatever actors you could get would be the sole survivors (some systems failed and most of the crew was lost). Not only would we get some nice closure to SGU, but all the benefits accumulated from it would help save us Earthlings.
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