2nd amendment won’t matter unless a very specific thing happens: the entire government and executive branches, namely the military, collapses. It really depends on what the military does and enforces domestically. Whatever government the greater military props up wins and nothing individual citizens do can compete with that.
If everything collapses, famine will be the prime mover. And if you’re not part of a roving band of armed looters or an entrenched armed community, you’re screwed.