1. Germany would be impossible to bomb without exceedingly high casualties if those jets were used as bomber destroyers.
2. Germany may not control the space over the frontline because jets back then made great bomber destroyers but may not have been good dog fighters against mature piston engine fighters.
3. There would be a crash program to get allied jets in service. P-59 and Meteors might be mass produced and pressed into service.
4. We will not see Mig-15 or F-86 as they appreared in the late 1940s. They were based on swept wing technology developed by the Germans. If war had dragged on, then we wouldn't have that German research for these fighters.