"MoD+Retreat" defeated w/o killing caster

[K]

llamabeast said:
I have to admit I'm sad that this has been toned down from a red to a purple bug. Regardless of whether it's counterable it's still a horrible bug to be on the receiving end of.

The funny thing is that the same tactics that are effective against SCs and thugs are effective against MoD + BE.

Sure, every army doesn't need to be able to deal with these tactics, but isn't that the key decision to make? (Either make a reinforcing army to join a diverse army or make a stand-alone army)?