Sure we do. The starting price will be between $300 billion and $1 trillion in the first decade, and once a vote-buying entitlement scam gets a little steam, it always goes over budget.
Then the Babyboomers retire, and the number of retirees will skyrocket. Carry forward a couple of more decades, and you're in the cumulative trillions, easily.
Bush's prescription drug plan is a weed that can't be allowed to take root. It puts everything else at risk.