This reminded me of a conversation I had with my big brother in regards to Star Trek Voyager about 9 years ago when in that series, we all mostly know U.S.S Voyager was catapulted to the other side of the galaxy to the Delta Quadrant and was 75,000 lights years from Earth. Many stated that all Voyager had to do was head towards the Gamma Quadrant, head to that DS9 wormhole, then they can be home back in the Alpha Quadrant in a couple of years, if not months.
Then this got me thinking about SGU. They are stranded billions of light years away, dozens of galaxies away from Milky Way, with the only gate in the MW that they can connect to (supposedly) from Destiny destroyed when the planet exploded. What if every galaxy has this one-off gate and there is a special gate in the PG, the Destiny's database must have a library of these special one-off gates.
We also know with Atlantis, they have the one and only crystal that permits gating back to Earth from the PG. Sure we don't know the power requirements required to dial the 9th Chevron but assume they have it onboard Destiny and Rush and Co. finds the co-ordinates, they can dial to the Pegasus Galaxy, a ship (Daedalus) can head off to the PG with the control crystal, then they can dial Earth and send stranded people home.
Too simplistic? lol