That's basically where I'm at as well. Unless something suddenly clicks with this OL, be it players just start gelling and playing to their absolute max potential, or someone like Cannon comes back and stabilizes the RT position (and there's a domino effect on the rest of the line from there), you have to gameplan assuming Mac isn't going to have all day to throw. That means no long developing routes, which shrinks the field, and makes it even harder to get chunk plays. That's just the reality of the offense at this point.
Basically three things need to happen (and happen quickly so there's time to actually build off of the momentum going into the end of the season):
1) Trent Brown needs to get right, and be the Trent Brown we know he CAN be.
2) SOMEONE needs to grab the reins at RT and never let them go. I don't care if that's Wynn, Cajuste, or Cannon, just that someone becomes the guy there for every snap.
3) Cole Strange grows into the NFL enough that you can count on him on an island most of the time (this is actually the one I'm most optimistic about, IMO).
If those happen, the line can get "good enough" to actually evaluate the rest of the offensive personnel in the best light, and get more creative with the offense. But clock's ticking, on this year at least.