OTC Derivatives - a dangerous house of cards?

The renewed crisis in the credit markets that has been triggered by concerns about peripheral member states of the Eurozone festers like a slow-burning bush fire. As we have warned before, the regulators and politicians have still not come up with a credible solution (we avoid the expression 'final solution' but that is what the financial markets would really need).
Case in point is the concern about the gigantic gross exposures that nestle within the financial markets - and the extreme level of risk concentration that does little to assuage concerns. No one can really predict what would happen if there is a new bout of extreme market volatility - if key variables like stock markets would move by 20 per cent of more in one day. At a time when markets get excited about wholly inadequate hikes in margin requirements for gold futures for example one has to assume that drastic moves would take the majority of market participants by surprise.
A simple remedy - no PhD's required, or expensive 'accountant.consultants' - would be the introduction of meaningful margin and capital requirements for ALL derivative contracts that are on the books of any bank, fund manager or other counter party.