I guess this is kind of the opposite question from one that I saw on this sub a while ago where the op was interested in limiting a stories scope so he didn't get overwhelmed with change. I want to look at what would happen if magic suddenly got introduced to humanity under the following conditions.

• Inherited: not everyone can do magic not even most
• Overpowering: a single mage could comfortably take out an entire nation of non mages
• Better: mages are smarter and faster than there non-mage counterparts.

I think the most important part of this scenario would be the ration of mage's to non-mages. If almost everyone is a mage things would probably be fine. There would be some adjustment as certain parts of our conventional society became no longer necessary and others grew to replace them, but ignoring what might be a violent transitional period everything would end up mostly the same. On the other end we have a situation where mages number in the 100's in which case we might just end up with them going off somewhere and keeping mostly to their own company. The bad zone in my mind is between 1 and 80 percent of the population as mage's. Here we get violence and quite likely a certain amount of displacement of the current power groups.