Yes, but I wouldn't phrase it as being in some sort of jeopardy, however.... but the CMBR/first-stars/galaxy-evolution parts of the model seem to be in jeopardy of needing revisions, at least according to a persistent thread over on the cosmoquest forum.
The earliest stars and galaxies, and clusters, have been almost completely unobservable, even with gravity lensing of quasars, so the JWST should be able to allow a better understanding of their formation and composition. Perhaps they will find slightly more metals, for example, than expected, which would likely speed the rate of those formations.
Hopefully, there will be some big surprises to keep a lot of scientists, like Jerry, happy. [I assume you were referring to his posts. I have always admired his efforts to scrutinize some popular works, like Type 1a SN. I just wish I could understand it all.]