Investors’  habit of bagging stocks during temporary slips could be going away, El-Erian warns.

The firm has a sunny view for stocks up ahead, differing from the likes of Goldman and BofA.

The former UBS securities broker faces up to 20 years in prison for defrauding investors out of more than $30 million.

Investors could see either a 1970s-style double-digit ripsnorter, a return to a more normal level, or something in between.