on the contrary saying brock or sage should start makes a heck of a lot more sense than bringing marino back, or even having gus or AJ start for that matter.
Sage - has only been given one start in recent memory - the baltimore game last year. and while he didn't blow them away, he performed better than AJ did in his first game with us. In fact Sage performed well. So it can't hurt to give him a shot. the preseason is the time to do it guys, not regular season to experiment here.
Brock - he's a complete rookie, new at this game just as Orton, Smith, Frye, or Orlovsky. He's not a star QB obviously, but he hasn't shown anything this preseason to prove he's NOT worth taking a shot at. If he came out and played like absolute dogcrap like Rodgers or Smith has, then i could see. but Berlin has played admirably enough to warrant trying him out. who knows? worst case scenario things stay as they are now. Best case scenario, Brock proves to be our QB of the future, and we can just take this season that apparently lacks promise anyway and get ahead of the game in the grooming department by having Berlin start for us.
Either way thats better than wasting another year going nowhere and waiting until NEXT year to draft a rookie QB just to have another garbage year of growth next year too.