Basically, I agree with you. Old line traders are much a thing of the past and becoming more so each day. The big senior traders are generally still of the old-guard (see: Ace Greenberg, et al.). As for Quants I agree, however, MBA has been more of an 'also-ran' as opposed to a pre-requisite. I doubt many of them were screened to have an MBA unless there was some advanced math required, albeit, not necessarily Ph.D level math. In other words, I think many 30-somethings have been brainwashed into getting an MBA but really didn't need it for trading. Hence, many have useless MBA's that really aren't really helping them or hurting them.