The ancients were like the Europeans of old spanning the void of space, adding system after system to their empire.
I can just see it now, the ancients touch down and do this on a beach on some far flung planet observed by some Shivans in the Jungle treeline. Planting the flag in the sand the ancient recites "I claim this land in name of Spain!" LOL
The shivans come out of the jungle, with shoulder cannons blazing (which communicates as , "Not on my watch white man!")
Thus you have an oppressed people (the shivans), striking back at an invading force (the ancients). Unfortunately instead of the peace loving race they were before, after this perverbial stick in the hornets nest that the ancients started, the shivans themselves turned into explorers and conquerers...
On behalf of Terrans and Vasudans everywhere I'd like to say from the bottom of my heart, "Thanks a LOT you Ancient PRICKS!"
(Gee I better not get any emails from the AADL - The Ancient Anti-Defemation League)

BTWthere could be some ancient survivors, but this sis th only way. They launched sleeper ships to colonize new worlds. They had to put teh crew in stasis cause they cannot use subspace or the Shivans will find and kill them no matter where they go. I think the Ancients said it themselves, subspace is closed to them forever... Today it is a boogey-man tale, don't use subspace or teh shavians will get you!
Maybe GTVA finds one of these sleeper ships? (KHAN!!) lol or a world in a galactic backwater world that is their only remaining planet. If they did keep their tech up and were able to research more, other propulsion systems that DIDn't use subspace would have to be explored... think of the possibilities?