No. I already own plenty of high-capacity magazines, and there are no circumstances that could arise under which I would surrender such magazines.
For the sake of argument, if I were limited only to 10 round magazines then I would consider the alternatives. One of the biggest strengths of 9mm is certainly magazine capacity.
One alternative would likely be some form of 5" .45ACP with which I would only use +P ammunition (because otherwise .45ACP is just far too slow IMO.)
So... yes, the government in Australia did do a bit of rounding up of weapons and magazines. But anyone going door-to-door here in America demanding that we hand over our weapons isn't likely to have a very long life expectancy.
G19 Gen3 / G26 Gen3
"Only tyrants need fear tyrant-killers."