It does not surprise me that there have been no arrests. There are few LEO's interested in actively enforcing the laws. However, that there have been no arrests does not give me any "hope". The purpose of the law from Bloomberg's point of view is to make it riskier to own guns. That does not change if no one is arrested for violations. Because anytime an LEO decides to make brownie points with Bloomberg - and there are still plenty of Bloomberg friendly mayors and police chiefs around - we are at risk.
The point of the law was to turn us into Massachusetts or New Jersey where you never know if an innocent action will create a felony.