I'd take that bet.
Guy in our gym did TKD for 18 years. Black belt and all. First night of Krav he puked, but he kept coming back. He was quoted on the gyms site as saying, “I have spent many years in other Martial Arts; I thought I could defend myself. After dedicating my time to Krav Maga, now I know I can defend myself."
Hasn't even been in a year and admits he's much better off in real world applications now than with 18 years TKD.