Originally Posted by yurtripper

You should in fact get status until February 2020 under the existing terms. That means there's no need to worry about pushing for 25 stays in SPG this calendar year.
As for keeping Plat beyond Feb 2020, all bets are off until the details emerge from Marriott as to what the qualifying rules will be in the unified program (i.e. what we'll need to do during 2019).