Notwithstanding the widespread fascination with German Wunderwaffen, more of this or that shiny toy would not have made a difference for Germany's ultimate fate.
Let's also keep in mind that the resources and man-hours required to build all those jets would have had to come from somewhere. So which other part of the war effort gets short-changed?
And then, even if we assume that Germany is still fighting by August 1945...
Agree. Plus this topic has been beaten to death several times on this board. But I never object to newer members asking the same questions, since when dealing with "what if" speculations there can never be one final answer and this is a "discussion" board not an encyclopedia.
My opinion hnges on the folllowing:
(1) There is simply no way the metallurgical problems with early jet engines could have been solved much early by Germany no matter how much research was done.
(2) If significant research and production capacity was shifted to jets earlier, this would affect research and production of proven and very capable piston-engined types that could be produced in higher numbers.
(3) The performance advantages of the late 1944 Me-262 over piston engined fighters like the Tempest, P-51, P-47 was not overwhelming. What the advantages jets had in straight line speed (with very slow acceleration, by the way), they lost in manuverability, reliability, endurance, and servicability.
(4) Production, production, production. Training, training, training. Unless you posit ridiculously early introduction of German jets and a radical revision to technology and history, the Luftwaffe's jets will always be facing an opponent who commands the skies over Europe, outnumbers the Luftwaffe, and has more, better trained, and better rested pilots.
(5) As others have said, increased German emphasis on the production of jet aircraft before they were really perfected (arguably they weren't ever perfected) might actually have aided the allies.
(5) And as others have said, Me-262s aren't going to stop Soviet tanks.