

Presumably no one would have wanted to risk going through that headache again.

Why not use this to your advantage? You send out the Virus that causes the gates to lock up as they dial every gate they can think of until every gate is unable to dial out except yours. However in SG-1 we say they had the ability to stop Stargates from successfully dialing out by scrambling the DHD program so it dialed random, useless, addresses.
