Trump is the embodiment of two things.
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1. If the next President only appoints one of his relatives to a high position, it will look like an improvement (the Kennedy brothers were an example of what the US government should NOT do) of what has come immediately before, instead of a reversion to the standards that existed before hand. This also includes tax return releases, etc.
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2. What may come of this (potentially) is a strengthening of laws/rules, etc., that have been there all along, yet no one has truly tested them. Trump truly could shoot someone, and only the Congress could move against him. The presidency is an elected Emperor.
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As for parliamentary democracies, since the PM always comes from the majority party, they too are an elected Emperor.
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Every PM since WWII has increased the centralization of the operation of the government. It has started to become especially noticeable since Mulroney. The person may change in the job, the machinery remains.
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Democracy is thin.