I think Hershel goes down with the farm, probably his younger daughter, and maggie will be torn about staying with her family or going with Glenn (who is an idiot). I just think it's funny how humanity is outnumbered thousands to one and everyone just wonders about the farm like it's little house on the prarie. Then Dale dies and "oh crap now we better do perimeter checks, worry about boarding up the windows, check the fences...ect.
And if you know that walkers are attracted by gunshots and follow them for miles, then why not go to the total opposite end of the county, fire shots off, and draw them away from the farm. It seems like a remote area and you wouldn't run the risk of attracting more zombies.
And was herschels family bitten? Maybe that's why he thought there was a cure.