I think whether you are a professional client or a prudent retail investor, you shouldn't have too many problems as you wouldn't leverage too much in your positions.

But it's true this could limit some diversification in retail portfolios because of margin increases.

Futures are not an option for most people as the leverage can be sometimes excessive for one contract, so you better keep on forex and indexes only or try to use options or anything else.

Again, i think if you are a prudent retail investor you shouldn't notice too many changes.

We'll see.