How about do nothing with the offensive line?
That might sound like heresy, but it is an option, and here is why I don't think it is a terrible option.
- As Kapp pointed out, swapping offensive linemen in, out or around for non-injury reasons during a season is a really bad sign. That means the guys who won the starting spots in camp are now playing so poorly that a guy who didn't win a spot is deemed a better option. Pretty rare to see that happen and I while I don't have any stats to back up the claim, not likely to result in massive improvement at the particular position that was swapped, nor improve continuity and effective teamwork along the rest of the offensive line either.
- In 2 of the 5 games the Vikings have played so far, the team got so far behind so fast that running wasn't really an option. Sure, the Vikings still suck in rushing yards per game and yards per attempt, but they also are near the bottom in total attempts, and those include quarterback scrambles. I guess my point here is yes, the offensive line hasn't been opening gaping holes or anything, but the Vikings also haven't tried to run all that much compared to other teams in the league. The Vikings have a total of 96 rushing attempts so far, while the top team (Cleveland) has 153. I'd expect more focus on the run game if the offense can get ahead and/or the defense can keep the score close.
- Philly is the 2nd rated rush defense in the league, and while the Vikings didn't pile it up against them, they did manage 77 yards on 23 attempts for a 3.3 average without Dalvin Cook. Murray ended up with 42 yards on 11 attempts for a respectable 3.8 YPC average.
I think it's likely that the offensive line, like the defense, has played about as poorly as they are going to play all year. It isn't a great unit with a lot of established talent, but I think there is reason to believe the entire unit can and will play better as the season goes on. If the Vikings can get Cook healthy and effective, he'll make the unit look better too, at least statistically. Murray is a pretty effective runner after contact as he's shown throughout his career, but he doesn't have the second gear, so while he breaks tackles, he is slowed enough for help to arrive. Cook is a little more dynamic. If he makes the first guy miss or gets through a tackle attempt, he can accelerate away from the help and pick up more yardage, and that helps the stats even if the offensive linemen aren't opening the highway. Lastly, the defense can't possibly play worse than they've played to start the season. Yes, the offense put them in some bad spots, but they've played poorly and have allowed the score to get away from the team, forcing the offense to become more one-dimensional. Better defense means the offense can afford to focus more on rushing, especially later in games, and that should help them be more effective.