You are right; Beto can't win but I think somebody is coming to our front doors to ask for our guns. Who will they be? This is just speculation of course but I think it will be UN troops. Lots of them have trained with US troops already. For example, Indonesian UN troops are not likely to have strong opinions about gun ownership in the US and would most likely just follow orders.

Whereas, and again for example, if 82nd Airborne troops from Ft. Bragg were given the job, you can be sure every one of them already has an opinion. If, in a given situation, force or even violence were required, how would US troops perform against their own countrymen? That is the question and the reason foreign troops would be used if that scenario arises. Also, if you were in charge of Operation Take-back, would you even want those heavily-armed, well-trained US troops in the general vicinity?

When will it happen? If a Democrat is elected president next year, it will happen soon, maybe within a year of him/her taking office. If Trump is reelected it could happen before the end of his next term,