A little too much panic here. You are only going to have 7 OL active for the games anyway. That means you bring Bernie and Collins as backups, which I felt was a virtual certainty anyway. You switch Free to LT if something happens to Smith and move Collins to RT preferably. If not then you let Martin slide to RT and put Collins inside. Either way there will be capable replacements to man any position that goes down.
What the coaches are finding out early in preseason, just like they are supposed to, is that Weems has a looong way to go before you can activate him. I suspect you are going to see one more week of them giving Weems a chance to correct some things for the second preseason game while starting to show their hand a little bit in the ensuing practices by playing either Martin or Collins more at RT.
The reality is that this is what the early games in preseason are for, to iron out the question areas of your team and attempt to build a little depth. They are giving guys who don't belong on the roster yet an opportunity to prove they do. The contingency plans are already in place if they don't see what they need to from these borderline roster players like Weems.
It really is an embarrassment of riches when your top 7 OLineman are as talented as the Cowboy's are and you are wringing your hands about who is number 8. Unless a disaster happens the starters like Free and Martin provide all the versatility this team will need in a crunch at tackle. I mean honestly if both starting tackles were to go down in the same game this team still has the ability to move Martin to LT, Collins to RT, and Bernie to G in what would truly classify as a disaster. What would most teams have to do?
If you want to worry about something, worry about backup QB, where there is absolutely no one to play the role of Beuerlein should we lose Romo for a 3-5 game stretch during a championship run.