I don't see a suspension coming, and Kyrie Irving makes way too much money (especially on a per game basis) for a fine to deter future antics. How much would that have to be? $10m per finger?
Re: history, I don't think things were much different in the 80's.....
Larry used to talk so much trash that he got into fights on the court (actual punching, not flashing a hand gesture).
Neither Dr J or Larry got suspended. Both got fined, but I don't think it deterred his (or anyone else's behavior).
Laimbeer committed a real dirty tackle of Larry, and Larry threw punches. Ironically, Parish is the only one that got suspended.
I don't think there's a track record of stars getting suspended in the NBA playoffs, and certainly not for hand gestures.
Celtics fans- let's embrace this moment and hope to see the Celtics beat KD and Kyrie while they are on the court. They just did this, and it was incredibly satisfying.