Let's say that in 1941 the RLM gets fed up with the slow progress of jet engine development and postpones jet engine/aircraft development indefinitely.
Instead they focus on building the DB 604, Argus 413 and Jumo 222 piston engines, and issue a new specification for Germany's next air-superiority fighter, powered by a single powerful piston engine driving contra-rotating pusher propellers, with tricycle landing gear and four MK108 cannon in the nose. It enters service in early 1944. Also, production and development of the Do 217, He 111, and He 177 is stopped so that the Bomber-B program can be completed.
Any thoughts?