If we look at what the news actually is, it may not be that significant. It didn't say there was any money laundering bribery etc., just that the controls were weak. If what Howie says is true, that they have 400 programers on staff and can adjust the software quickly, they may be able to correct this easily.
There are no penalties so far. BGCP agreed not to launch any new lines or make any new acquisitions for at least six months, in the UK only. This may be nothing.