We already had regulators in place that should've sniffed out Bernie Madoff and numerous other unheard of local Ponzi scam artists...How'z that worked out?
In fact, I'd say that the SEC has to be the most ineffective, derelict and plain old corrupt bureaucracy out there...Why give people who've failed miserably any more power?
What is the difference between having no regulation and having regulation but not enforcing it? That is de facto deregulation.
But you miss the point. The legislation will force many more derivatives onto exchanges, which will increase transparency of pricing, require daily mark to market of collateral, and take power away form a handful of firms which control pricing in an opaque market. How can anyone be against that? This is what is required of stocks, commodities, options, futures, etc. Why not derivatives, especially now that it represents six times the gross domestic product of the world? What is the argument against making a market more efficient?