There's no planned replacement for the American F404 for Hürjet, at least on the public space. F404 is an old, reliable engine that is used by most of the world, have no cutting edge features and some alternatives for it exist, so thinking must be that we don't think Americans will stop its sale. Armed version is of course another issue.
Reason we are building TF35000 for Kaan is not just that we fear Americans stopping its transfer, but also that F110, one of the most efficient and powerful afterburning turbofan engines in the world, is not good enough to unlock Kaan's full potential. TF-35000 is possibly our most ambitious project, moreso than Kaan, Batu for Altay, even the aircraft carrier.