After really thinking about the O-Line situation, here is what I think:
LT: Flozell Adams (Good)
LG: Larry Allen (Good for now, replacement for future)
C: Al Johnson (He's not horrible, so I'll make this Fair)
RG: Marco Rivera (He's not good, but an offseason should do a world of help)
RT: Rob Petitti (He's not good now, but an offseason might do him good)
I would say we should get a veteran RT in the FA, just so that Petitti can have time. If Marco Rivera gets to the level we all want him to be at, we wouldn't need to worry about that yet. We should also get a LG in the draft that we can develop, maybe Max Jean Gilles?
So far, I think we would only need to bring in two players to bring our Offensive Line back to respectable/effective. If all this happens, then:
LT: Flozell (Good)
LG: Allen (Good) <Young guard in his wings>
C: Al Johnson (One more year, we should address this next year)
RG: Rivera (Good pending a good offseason)
RT: Runyan/Backus <Petitti in the wings>
So, the only "if" factor that really worries me is the fact that Marco Rivera might not require.
A trade to get 2 1st rounders would be good, so we could get an OLB (Lawson, Carp), and then Max Jean Gilles. That would solve our guard-of-the-future problem. As long as we pick up a good RT in the FA, that shoudl be all we need to fix the O-Line for now.
I wouldn't expect Parcells to go after 3 offensive linemen. 2 sounds more plausible...