Brave recently released their MAU statistics which has reached a rather impressive 16.7M:
https://mobile.twitter.com/BrendanEich/status/1290312177182621696?s=19It's a subject of debate, but Brave which uses BAT as it's token, is somewhat of a 'sleeping giant'. Personally, I can see Brave being very popular with millennials and Gen Z, particularly with gamers as the browser could potentially be used as a way to pay for gaming memberships with BAT. I'm also looking forward to their ad platform which is due to be released and other applications in the works.
As more products and features are under development for brave browser we can easily expect brave to be the top browser in few years. As far as BAT tokens are concerned i think the ecosystem needs to grow as well with may be different advertising products so that demand for BAT tokens can be created from within the browser itself.