Wingnuts haven't said or done anything to convince anyone that assualt weapons are a part of the second ammendment so in that way, yes, it is obsolete.
The Supreme Court disagrees with you.
District of Columbia v. Heller:
United States v. Miller, 307 U. S. 174 , does not limit the right to keep and bear arms to militia purposes, but rather limits the type of weapon to which the right applies to those used by the militia, i.e., those in common use for lawful purposes
DISTRICT OF COLUMBIA v. HELLER
United States v. Miller
The signification attributed to the term Militia appears from the debates in the Convention, the history and legislation of Colonies and States, and the writings of approved commentators. These show plainly enough that the Militia comprised all males physically capable of acting in concert for the common defense. "A body of citizens enrolled for military discipline." And further, that ordinarily, when called for service these men were expected to appear bearing arms supplied by themselves and of the kind in common use at the time.
United States v. Miller
What weapons are in common use right now?
If the government were to say that the only private gun that is legal is a single shot musket that would be in opposition of the meaning of the constitution. The point of any militia is to be effective in mounting a defense against foreign and domestic invaders.
The only reason we're even talking about this now is Obama wanted to invent another "important issue" he could use to divide us with.
Who was it that said "A house divided against itself cannot stand". - Abraham Lincoln
Enemies of this nation believe in division. Pitting one against another. Obama refuses to adhere to the number one goal of a good leader, to foster unity of purpose. He can only divide and marginalize.