A minor point: Joe Frazer was an executive with by-then-defunct Graham, which produced its last cars for the '41 model year. These beauties used the old Cord Beverly/Westchester body dies jointly with Hupmobile. But I digress.
There were many-my late father included-who were absolutely convinced Preston Tucker was dishonest. He was, in fact, accused and later exonerated but by then the damage was done. It seems to me (my own interpretation!) that the big boys didn't see him as one of their own, and wanted no challenges from an outsider. Kaiser, on the other hand, was a major magnate and he had Joe Frazer, a Detroit insider as his partner, so they were judged to be more or less members of the club.
I suspect that had the legal and financial wolfpacks not converged on Tucker, he could have had a modest run at success--say, lasting until the Korean War impact began to be felt. There would have been something of an attempt to save the marque (perhaps a merger with Kaiser-Frazer?) and perhaps survival through the '52 or '53 model year. But after that, time was running out for the postwar independents overall, so it's unlikely to me that the marque could have survived much longer.