The thing about Trump’s dystopian imagery is that it has a sell-by date; if in 2019, for example, he is still saying that crime is out of control, it will be perceived as his fault. Anyone who is foolish enough to buy into the imagery should logically be looking for a better Batman at that point.
One potential exception is foreign terrorism, since its origins, by definition, lie outside our boundaries; Trump can, therefore, plausibly disclaim responsibility for any events that occur between now and the end of his term and argue that only he is tough enough to deal with our adversaries. Keep your eye on this issue; it may represent the key to his re-election prospects in 2020.