If they're going to keep the show going for a few more years, they'll have to create a "goal" for these people to accomplish whether it be finding a legit "safe" zone where a new government is taking root to take back control of the country or find a cure for the zombie-ism.
"On the run" TV shows like the re-booted Battlestar Galactica at least had an end game to their wandering of the universe being chased by the Cylons: finding earth.
Totally agree. And this is what bugs me about the show. They have no ultimate goal other than to survive, which doesn't seem realistic. Like you said, they need to find out what happened and what's happening. Is the government still intact? They have to be to a certain degree. I would imagine that they got the president and cabinet into a bunker. And the military can't be all gone. No way. Seeing how easy it is to kill the Walkers, I have to believe that some military group is still functioning somewhere.