DanielNiccoli - We will not be providing a free license for 2019, we've said that multiple times in multiple places. Did you listen to the recorded session linked to above? If so, and you still aren't sure: If you only need 2016 for recipient management - keep using it. Until we release a solution for removing it. That's it.
"For this reason, we want to make our recommendation for this scenario clear. Our broad recommendation is to keep Exchange Server 2016 in production use until such point as we release a solution that allows those servers to be removed. "
During the recorded session I clearly stated we did not have an update on when you would be able to remove that last server, though I did say we continue working on it.