Porsche's withdrawal from LMP1 gives the World Endurance Championship a problem. Actually two problems - one short-term and one long-term.
The German manufacturer's decision means that we're either going to have a single manufacturer at the front of the field in the WEC and at the Le Mans 24 Hours next year or no manufacturers at all. Neither is a particularly satisfactory state of affairs.
That's the short-term problem. The longer-term is highlighted by the fact that new regulations for 2020, which Porsche's P1 technical boffins helped formulate, weren't enough to persuade the company's board to hang around in what many of us consider to be its rightful place in the world of motorsport. And by that I mean the top flight of international sportscar racing.