I don't trust the Mayors' crime data. Whistleblowers, for example, have reported DC was grossly underreporting crimes. The "people" tend to agree as no one thinks crime in under control in most big cities. Plus, even if you accept the data, crime is coming down from the unprecedented heights it reached during COVID/Floyd. So, congratulations for that.
If Trump sends in NG it would be litigated as to whether his actions meet one of the exceptions to the PCA: (a) state's request (unlikely, given the political environment); (b) rioting and insurrections; (c) to enforce federal law; (d) to protect civil rights when states are unable/unwilling to do so.
So, it doesn't really matter what I think since the courts (likely SC) will decide whether his actions are legal and constitutional.
I still don't think Trump pulls the trigger. The success of the DC operation, together with Mayor Bowser's cooperation and acknowledgment of success, is placing pressure on Johnson - particularly with the Labor Day shootings.