Will Cuckerberg run in 2020? If so, will he win the Democratic Party nomination? If he wins the nomination, will he win the presidency? If he wins the presidency, what kind of president will he be?
IMHO, the ball is in Trump's court. As long as he does not screw up by getting us into a major war or causes/is framed for an economic collapse, he should win re-election. But if either of those happen, all bets are off.