You're right...it'll probably be closer to $200B, when all is said and done.
But that's the way the system works: it's easier to justify spending lots of money at once to fix what breaks than spending less money over time to keep it from breaking in the first place. (Actually, it's less "the system" than it is the American psyche). I'm sure you see the same thing where you work, I know the public healt system in this country's designed around it, most of the government works that way (BIA's doing just that right now, NASA is an excellent example as always, so's USACE judging by everything EII and my sister-in-law tell me.) No one will ever put enough money into maintenance as long as maintenance is scorned upon by American society.