In Eureka, after the crew of the Astraeus is rescued, they still have the ship and all the equipment they had previously. The crew is trained, and, other than one member, they're all still available.
Considering the expense put into the mission in the first place, and that everything needed was still available, and that a minimal amount of additional training (including a debriefing of the whole matrix thing) would be needed to keep the crew in prime condition, is there a good reason why they didn't just re-launch the mission?
Why was it just abandon and the ship and the transport technology ignored? This was the town's big focus for a long time, so to just drop it once they rescue the crew doesn't seem to make sense.