I have long studied asymmetric warfare as it applies to insurgencies and revolutions. Your fear of what is coming is justified, but your pessimism of outcomes is not. A protracted, armed insurgency by an industrious, resourceful populace has a better than good chance of throwing off tyranny.
Remember, there are many of us in their ranks. Many. Our puny rifles cannot stop a tank, but an EFP can. We are Americans who have crazy skills. Hell, the average Cletus can build an EFP with what he has in his workshop.
lol I DO like your attitude.
Also, you don't attack the "tanks". You attack logistics and personnel that support and operate them. Those MRAPs the police are getting will be driven by guys that live in our communities. They shop where we shop, drop their kids off at the schools our kids go to, etc. If going out to get the morning paper off the front lawn becomes a dangerous prospect, there will be fewer people lining up to apply for the jack-booted-thug positions that are available; either through attrition or self preservation.
The people in the tank have to get out sometime. Once out, they're vulnerable to rifles, arrows, Molotov cocktails, and a lot of other things, including garrotes. Don't become so fixated on the tanks that you forget the people riding in them.