I thought about that years ago. After all if the DL can do it why not the OL? It just doesn't work. As it was said, they need to know what their teammate is doing on every single play and every single defensive stunt.
In prior years I have read OL players say that it took them 3,4 maybe 6 games to gel as a unit.
The other factor is that the quality is not exactly the same for every OL. You don't want to have a drop off in talent right in the middle of a drive.