The notion of handing Donald Trump the ability to rule by fiat, let alone other national leaders, is beyond rhetoric, it's not even contemplatable.
We need coordinated, responsible leadership. Most governments have all of the constitutional powers they need at this time.
The people elected Trump, so why not give him a dictatorship for 6 months? After all, it's within the President's power to declare martial law for times of emergency. It's the job of the voters to make sure they don't elect someone who can't be trusted with the awesome power available to that position. The same goes for any democratic country.
The powers of the Executive, Legislative and Judiciary exist to balance one another out especially in times of crises when some dictator could come along and declare himself ruler.
The people didn't vote for a Dictator, they voted for a President with very limited constitutional powers.