The PTB have gotten everything they've wanted and more through other means. The U.S. has already been conquered from within ideologically and demographically. Letting Americans keep their pistols and rifles is no big deal; comparatively they're now about as effective as the rocks the Palestinians throw at Israeli tanks. The technology the government has is fearsome; all it would take is a few demonstrations of it against some American rebels, an updated version of the extermination of the Branch Davidians in 1993, to cow all but the survivalists in the middle of nowhere into submission.
All very true, but the biggest weapon the U.S. has, by far, is The Fed.
Without this weapon of mass deception (The "Federal" "Reserve") there's no way the U.S. could finance the apparatus and personnel necessary to support the surveillance/police state, the warmongering with thousands of $100,000 private contractors and hundreds of billions to the "defense" contractors to build these fearsome technologies and weapons to kill humans by the millions, the welfare state, the endless propaganda and psy-op campaigns, etc.
If we had an honest monetary system with the creation of money handled by Congress as enshrined in our Constitution,
"To coin Money, regulate the Value thereof", and backed by gold and silver, this would all disappear in an instant. The fact that "our" "elected" politicians do not support this, outside of Ron Paul and a few others, shows just how much we have been
"conquered from within" and where their allegiances lie.