But it should, and you know it.
The purpose of good church discipline is to lead the disobedient to repentance and reconciliation. When the loss of communion doesn't work, excommunication may. After all, we don't need to be PROMOTING HOMOSEXUALITY AND ABORTION IN THE CHURCH DO WE?
Excommunication is not going to happen. The hurdles that must be overcome are too high and too many. Campaigning for it is futile.
Canon 915 is not about excommunication.
Canon 915 merely prohibits an action which is always a mortal sin: giving Communion to notorious grave sinners.
More people need to raise their voices against the bishops who are insisting that their priests COMMIT this mortal sin.