Looking at the aerial for Ross' more authentic version reveals less than 50 bunkers which in and of itself is fine and may well have been a better golf course. But, I would be hard pressed to think it would present the same challenge and be up for another US Open. Perhaps it would be a wonderful Women's US Open venue?
And while RTJ's fairway bunker scheme is totally over the top, it is likely the reason the course is considered so tough? I pose this as a question having never been on property while still knowing the greens are considered to be full of challenge and perhaps the course's most distinguishing feature.
Lastly, the price tag seems extraordinarily steep for essentially removing a ton of bunkers, widening fairways, and removing trees!