I believe naked shorting is already illegal in the US, but the requirement to borrow and deliver just not enforced by the SEC. So, of course, the SEC should require delivery or the trade gets busted. Those who think that shorting more shares than the total float really would be happier in Vegas. And that's been one of the problems in the US market in recent years -- non-enforcement by the SEC, with the result that the market begins to resemble las Vegas more than an orderly securities market. Very pleased to see that the Germans have put the clamp on naked shorting, but I was under the impression that the Europeans were already enforcing the requirement to borrow, so I don't quite understand.
With regard to shorting via options, I see no problem, since the increase in IV as the underlying falls will naturally put a damper on runaway shorting, and the options will follow the underlying. So if you enforce the rule against naked shorting of the underlying that should dampen runaway shorting via options.
We need a more competent and vigilant SEC. Maybe that is coming under Shapiro.