So your theory is that 35% of the American population (presumably mainly whites so, what, half the white population of America?) is not just racist but SO racist they don't care about anything - even Russian interference in the Presidential election! - except kicking out foreigners and non-whites? That's a pretty wild claim.
Not for anyone who has been paying attention.
There's also the fact that if Bannon is the mastermind we're supposed to believe he is then he must know the US isn't like Game of Thrones (or Nazi Germany for that matter). The whole system of government is set up to stop a crazy or incompetent leader from doing too much damage.
Which is why exactly why Bannon wants to take down the system.
And no, Bannon is not a mastermind. He's just the guy who for now is pulling the strings and trying to keep it that way. Kushner/Ivanka could stop him if they tried. Christie and Guiliani were once in Bannon's shoes. Priebus would like to be. It's a precarious position.