A "credit recession" sparked by the U.S. housing market downturn and excesses in structured finance may last more than two years, and the financial sector will undergo "massive consolidation," two leading Wall Street strategists said Wednesday.

Credit Crunch

The fallout from deteriorating subprime mortgages and the broader housing and credit crisis will eventually lead to a healthier market—but not until after a prolonged purging process, Jack Malvey, Lehman Brothers Holdings'schief global fixed-income strategist, said in New York.