The popular narrative circulating in Washington is that Donald Trump is finished. Even if, after a while, he tries to make a comeback, his brand has become so toxic that it’s unlikely he can dominate the Republican stage anymore. He won’t be invited to speak at Republican gatherings. He won’t be asked to campaign for GOP candidates. He will be shunned by the Republican Party now and forevermore. Oh, really? Indeed, losing access to Twitter crippled Trump and his ability to communicate with his followers. But no one has taken away his email account. And there are other social media...