Agree in theory, but the issue is that the guys we're counting on next year were sitting behind the OL this year, with the exception of Petitbon. It's possible with a year of development, they end up being a better unit. I'd say it's a lot less likely (but maybe still plausible) that the coaching staff was simply playing the wrong guys. But overall I think it's pretty unlikely our offensive line takes a step forward barring some unexpected new additions.
If I make a wild guess today, Clapp, Gulbin, Petitbon, Sharpe and Gordon ends up as our starting line.