"Too extreme" is putting it mildly. Most people couldn't even afford to go to law school. A great many wouldn't have the spare time to study another specialty and a lot might not even be capable of competently understanding the material even if they did go to law school (we all have our strengths and weaknesses after all. For example I'd be a hopeless doctor, chef or teacher). And that's before you've factored in that you also need to keep on top of any new case studies and changes in legislation else risk your knowledge becoming irreverent.

In short, if it were that easy then more people would do it since the kind of jobs it unlocks generally pays pretty well (easily above the national average).