Does this sound like a guy who would do anything substantial to reverse Trump’s worst policies? If we’re lucky, he might reverse the Muslim ban and let a few people out of the CBP camps. If we’re not, he’ll implement a much quieter and more effective version of the same policies, and partisan Democrats will reverse-engineer justifications for these being somehow necessary (or just ignore them, as they did during the Obama years). Recall that Bloomberg once argued that every Social Security card should have fingerprints so unauthorized immigrants would be unable to get jobs.
On the other hand, in some areas Bloomberg would likely be worse than Trump. As Mehdi Hasan writes at The Intercept, Bloomberg is a committed and pitiless warmonger — he supported the war in Iraq and repeated the Bush administration’s lie that Saddam Hussein had plotted 9/11. (In January he said he had no regrets about doing so.) He opposed President Obama’s Iran deal, and had few complaints about Trump’s assassination of Iran’s Qassem Soleimani. While Trump has escalated conflicts across the globe, he appears to have at least a mild hesitation about starting new full-scale wars of aggression. The chances of a shooting war with Iran probably increase if Bloomberg wins in 2020.
Given his wretched politics, even Bloomberg’s superior competence is a mark against him. Right now one tiny silver lining of the Trump administration is that the people trying to commit atrocities through the federal bureaucracy are so inept they keep fumbling the legal procedures and getting stopped in the courts. Bloomberg is sure to appoint competent authoritarian maniacs.