Enterprise was a very good series, although there really wasn't supposed to be a season 4, so they made season 4 interesting by tying into the movies and original star trek episodes when they could.
What did Archer have and Picard didn't? Pockets!! Thus Enterperse > NextGen/DS9/Voyager crap.
Though The original series still pwns Eterprise no question about it...
Everyone had pockets in all of the series, just that in enterprise everyone had way cooler uniforms and more than two non-spandex pockets.
But, star trek is great in general. It's like fs, everyone figures everything out for themselves and by collaborating with friends and allies. No god races, if the ancients were to return to the scene in supposed fs3, they'd probably be much like the almost exterminated and degenerated species everyone would expect them to be. When you're almost exterminated and barely get away with enough people to make a population again. You're not always going to get away with the person who knows how to build the ships, the person who knows how to make the alloys for the hulls, the person who knows how to do the systems of the ships. Essentially the people that would have survived would be the people who know how to do everything else, and all of the people would be the ones who know how to use their technology but not make it.
It's sort of like how a computer enthusiast can build a pc but not exactly build the processor for the machine. Granted some people who knows what it takes to build ships would survive in such a scenario, but it'd be like pepper in salt. Salt being everyone else that doesn't know how to build ships, and the few specks of pepper that do know how. I mean it's not like a whole entire ancients equivalent of triton dynamics managed to survive and stay in one group that gets settled on a new random planet 8000 years ago. So yeah i'd say their society and culture became degenerated, and by the time anyone finds the ancients again (measuring by human development terms) after 8000 years coming from a stone age to being as advanced as terrans or vasudans or less so but being able to go from system to system in the least is possible. It took humans some 6000 or more so years to get where we are today developmental wise.
The ancients being on the same level of young races to have reached the stars like terrans and vasudans would be very likely. Unless they're gods in a different galaxy and being extremely arrogant either no longer carrying about wiping out the shivans, or are going to but feel they don't need to yet, or they would have or will conquer the gtva some time soon and kick shivan ass (if the ancients were so highly advanced and with their militaristic conquering nature...yeah they'd conquer the gtva and oppress).
From what we know of the ancients in the fs1 cutscenes, i think it's very obvious that they wouldn't be gods 8000 years later. It's obvious from the cutscenes and their messages that they weren't able to keep themselves whole (whole as a species, ancient knowledge-base, technology-base, etc.), otherwise they would have been able to take out the lucifer and then humans and terrans would have been oppressed by the ancients a long time before fs1 would have happened.
What would make a good story for the ancients popping up again, is to follow the way fs does things. Sort of follow up discovery of the ancients with as much curiosity, skepticism, and risk as discovering the shivans. Of course gti knew that the shivans were around for a while, until **** probably breached containment and followed terran forces all the way back to ross 128. Another thing that would make the ancients being in a story line again good is have them just as advanced as everybody was in fs1, and of course the gtva would be with beam cannons and everything with shielded fighters and flak cannons (no one said that the ancients advance as fast as TV species). It'd really make for a great switch up with the existence of another species with the gtva being the most advanced for once (second only to the shivans). The other way of discovering species the smart way fs does is by having teams of like archeologists linked with gtvi forces who find the new ancients homeworld so that the risk of accidentally discovering a new species gets lessened so that way nothing ****ed up happens like a war with the ancients because some terran transport pilot misunderstood what some ancient was trying to say (basically something similar to the way the TV war started i'm trying to refer to).