I don't think the Trump election, nor Brexit was anything close to right-wing extremism. Putin and Erdogan are both dictators (or at the very least, de-facto dictators), and are not elected, and as such do not reflect the will of the people.

Both the US and Europe have been ruled by very liberal leaders since the 2008 financial crisis and recession, and these liberal leaders are responsible for the subsequent weak economic recovery. I think Brexit was the 1st sign that the masses are rejecting liberalism, and it could have even been a sign of the death of liberalism.

From the looks of it, mainstream liberals are moving far to the left, including embracing radical ideas such as socialism (that has killed over 100 million people), and open borders (which basically removes any sense of sovereignty, or any possible rule of law). I would predict that liberalism will be pushed farther to the fringes of society.