Though you aren't wrong about Trump manipulating the media I think you may be downplaying the role of the internet, and social media, in the current political paradigm shift. It isn't just Trump, the whole world is moving to the right on just about every issue.
Media, entertainment, education, higher education, bureaucracy, mainline religion all were militantly controlled by leftists.
Where as leftists sat privileged and protected from cross examination.
The right became battle-hardened.
That's only one example. The EU elections should clue us in that the left is having a difficult time contending in the age of social media. Even with their de-platforming crusades to aid them.
It isn't cause we are inherently smarter then them, unlike the "elites" we must guard against such arrogance.
It is because the right has much deeper, consistent, and systematic worldview than they do.
The right is battle-hardened.
The left is soft, shallow, and unprepared to defend themselves.
I would also like to add that though we dominate the *argument* on social media, we do not dominate the numbers.
Twitter usage in particular is more prevalent among an urban socialite demographic rather than suburban or rural family demographics.
1.) We have more to gain than lose in terms of minds changed here.
2.) Despite having the numbers, their positions lack the intellectual firepower to compete with us on a level playing field.