What we know of his cabinet seems to suggest that things won't be that great for a lot of us. Priebus is as establishment as they come, Bannon's Breitbart is infamous for being anti-semitic, anti-lgbt, misogynist, and racist, and Linda McMahon is up for consideration just because she donated $6 million to Trump's campaign and has been his friend for a long time. Rudy Giuliani, Chris Christie, and Newt Gingrich are on the shortlist for his administration and they certainly aren't what I would consider to be outsiders. Joe Arpaio might end up in the administration and is one of the most controversial sheriffs in American history for some of his insane comments. David Bossie, the head of Citizens United, was Trump's deputy campaign manager, which doesn't bode well for people who want to get Super PACs and lobbying out of our political process.
So I'm highly skeptical of him potentially being "one of the greatest presidents," to say the least.