The subprime mortgage crisis began last year, and part of Lehman Brothers' business includes real estate and other businesses, so this is not a question of assets, but a question of economic health. I remember watching the news and seeing an interview with Greenspan, who said that more companies would go bankrupt.
Subprime credit and so on are all businesses invented by the United States, and this new business now seems extremely unhealthy. This "financial tsunami" should not be as optimistic as Bush said.