As soon as they make the decision whether or not they will do so.
I bought my Galaxy S6 Edge specifically because of Samsung Pay.
I am moving all three of my lines to T-Mobile regardless of what "decision" Verizon makes. If I had realized Verizon was going to do this again, I would have left them before I signed up for the Edge plan and bought two new phones on it. But with the difference between restricting Apple and restricting Samsung/Android phones I think is because Apple won't let them get away with that stuff. I am surprised that Samsung has let them get away with this, because not having Verizon, support will lose a big chunk of Samsung Pay potential US business.
But I should have learned my lesson one of the last several times they blocked services/apps for their own personal profit. 
When I heard about Verizon deciding if they are going to support it, I remembered all of the previous services they blocked me from or stripped from me (Google Wallet, unlimited data, mobile hotspot/tethering, Google Voice, etc.). I am willing to bet almost anything that Verizon won't allow Samsung Pay until they figure out how they can charge customers a monthly fee to use it or their own shotty version of it.
And I understand why Verizon does it. If I ran the biggest company, I too would charge suckers for services they could go anywhere else to get for free. I hope the profits they got from those services they blocked were more than the business they lost from it. I am moving to T-Mobile because they will buy me out of the Edge Plan that I just signed up for a few months ago... smh. I should have done this a long time ago. I need actual wireless freedom.
They may have friendly customer service (not the in-store) and a great coverage map but none of that is important if I can't use the features I bought the phone for. I will never switch back to Verizon.
