That's kind of good, because sarcoids are technically benign. It's bad in that sarcoids almost always come back aggressively and in many cases can only be managed, not eradicated.
So we'll hope for the best but expect the worst. New treatment options are being discovered all the time that can dramatically change the rules of the game.
Judge can count on one thing, though. While sarcoids are the number-one skin-related condition resulting in euthanasia of horses, typically because the tumors interfere with being ridden or are so unsightly the horse becomes unsaleable, when bad things happen I don't cut my losses and run.