I have heard whispers of Merc leaving F1, but the following article makes interesting reading at number of different levels.
Mercedes Benz is under pressure to cut costs in a big way, dumping F1 would a big step in the cost saving direction. It may be difficult to justify the extravagant F1 costs it they are laying off staff at same time.
Some speculative thoughts on the topic.
Where will the drivers end up, both have their contract coming to an end at end of 2020, will Lewis out Vettel at Ferrari or pull the pin altogether? I have read articles claiming Lewis is in negotiation with Merc and is pressuring.
What will happen to their F1 engine manufacturing. McLaren is a new engine customer, what are the implications?