It WILL if it has the teeth to deal with such offenders. Just like they do in other countries, that have a National Registration system. You start with a foundation for entry purposes, electrical qualifications fulfill that basic foundation, without them you're lost and on a hiding to nothing before you even start!!
Yes you're right, there have always been qualified rogue electricians, ...in a way they are worse than the electrical trainee's, because they will KNOW they are doing crap work!! These characters will also be hit hard by any deregistering from a National Register, because the rule will be, that you will not be allowed to perform any paid electrical work, nor operate as a self employed sole trader, or be employed as an electrician without that registration being in place!!