Moderator, Marriott Bonvoy & FlyerTalk Evangelist
Join Date: Oct 2002
Location: McKinney, TX, USA
Programs: United Silver; AA Plat/2MM; Marriott LT Titanium; Hilton Gold
Posts: 11,776
At worst Marriott will only drop you to Gold (they have been known to look at your last 3 years or so of stays and let you keep Plat based on that.)
You won't get any roll-over nights as you would not have any nights over the 50 needed for Gold.