Obviously not everybody would comply. Look at how many people do not comply with laws against murder.

The only laws that matter are the ones that prohibit things we actually want to avoid. People don't actually care about controlling guns; that is just a means. What people really care about is preventing murders/attempted murders.

This is why the gun control laws we have now are so ineffective. The people who disobey the laws we care about (murder) will definitely disobey the laws we don't care about (gun regulations).