After IRGC’s terror designation, a window of opportunity has opened for regime change in Iran. If the Iranian people could now be organized and led by a force in the ground (coupled with International isolation), the collapse of the Regime could be precipitated.
Had IRGC been weakened way earlier by global economic isolation, the public protests last year might have forced Iranian Regime further into domestic isolation. In the face of dual pressures from its own people and the international community, the Regime would then have collapsed.
"The IRGC is the Iranian government’s primary means of directing and implementing its global terrorist campaign," according to White House statement.