Retail traders are simply not affected by things like this. It's the HFT/market making firms that would be most damaged.
The reason why retail traders rarely succeed is because the ones that are good move to the institutional level (as it is almost impossible to support yourself by trading alone). The bad ones invariably trade down their portfolio until they are forced to get a real job.
This isn't to say that you shouldn't retail trade, but rather, don't rely on it as your sole source of income (unless you have at least 2mm-5mm dollars to trade with).