If it makes you feel better, by that game Michael Schofield will be playing one of the tackle spots (unless Okung somehow stays healthy), and he gets beat bad by 3rd/4th string guys. Tackles are like QBs, severe lack of decent pass blockers at the position, let alone enough to have depth in the case of injuries.
I'm not even sure what to think of Denver's o-line. They have been horrible in pass blocking, but the preseason play calling has been extremely pass heavy. They have been good in run blocking again, so I guess at least that part is promising.