Great idea but my only concern is, people HAVE to use the browser (Brave) now that's another story...
Now don't get me wrong here. It is just that i ain't sure about that part?

I mean if no one uses the browser? What will happen?
Very strong point. Which is also one and only I will not be investing in BAT unless someone can explain me if there is any "growing" without "Brave Browser".
For example here is one random google analytics printscreen for a regular website I worked on few months ago. 28% of people still use IE and that's not even newest version, mostly IE7-IE9

The point is that with Brave you will get free BAT for turning off the integrated addblocker at Brave for watching adds.
I think this might attract some users. Besides that it is a bit faster than Chrome, if you turn on the addblocker.
But I agree that it will be hard to convince users to switch browsers.
I however use it as a second browser and am quite happy with it.