One would have to think Tiger may have to use driver on 7 holes at Oakmont next year, probably on holes 1, 4, 7, 9, 12, 15, 18. The 3 metal would be used at 3 and 10. A long iron would be used at 2, 5, 11, 14, 17.
At Carnoustie, driver would be used on holes 2, 6, 9, 10, 12, 14, 15, 17, 18, up to nine times if windy, perhaps less depending on the direction of the breeze.
At Southern Hills, he could get away with only a driver on the 5th hole and the 16th, then leave it in the bag the rest of the round.