I've played Dornoch in the middle of winter many times over the past 10-15 years, and have several times played through the greenskeepers in the process of revetting bunkers needing TLC. I've spoken to them then and there and they tell me that it is a very complex procedure, requiring precision and patience. It is not a simple matter of cutting, putting in new bricks of sod and then moving on.
As for TOC, I'm sure that Shell et. al will be fine and dandy by the time that Spring comes along.