Originally Posted by
rankourabu
They will open up space on United flights. This is easy since UA serves AMS.
They should rebook, but I know the case of an award booking at last New Years' holiday, when LH downsized schedule eliminating a flight, where a 1K friend of mine had a C-award reservation on. UA claimed, there was no award space on alternate flights and offered to refund tickets & miles. It took multiple attempts to finally get alternate flights confirmed.
IMHO, OP is smart to look ahead and be proactive in case things over at SAS fall apart.