Will Trump start up his own Commercial Medium.  He will then have more power than the President.?

Not even close. First of all, Trump doesn't have the $$$ to start up any more doomed-to-fail enterprises. Not when he can't grift his mentally deficient inbred supporters at every turn.

Secondly, the POTUS has arguably the most power on the planet. Or close to it.

Donald Trump's incompetence and abuse of that power will literally go down in history as the worst President this country has ever had. I'm sure his Traitor supporters will get a footnote too.

He will start his own media company and twitter rival with servers in Russia.