The U.S. and Israel had a "flawed assumption" that the death of Supreme Leader Ayatollah Ali Khamenei would lead to the collapse of the regime, said an expert on the region. The U.S. and Israel underestimated Iran's capabilities and it's unlikely the regime will collapse, according to a Middle East analyst, who warned that Iran could now be more determined to obtain nuclear weapons. In an interview with CBS News on Tuesd... [3075 chars]