People often mistakenly do not make distinction between rights and amendments or the origin of the rights and the Constitution.
The Second amendment does not give us any rights - it just confirms that we have that natural right. Repeal of the Second Amendment will not cause us to lose a right to bear arms as it was not given by it in the first place. This amendment is purely declaratory - it neither gives nor restricts the rights of people or the government, just lists one of them.
In order to deprive us of that right, a separate amendment would have to be adopted that would specifically grant government power to disarm us.
Anyway, the issue is purely academical. The Constitution was never an obstacle to infringement on people's rights by legislature or courts or executive power when people tolerated it.
miko