I do not think that is the case. Most people (in here) concerned about Dak are those that have seen this movie many times before (with this team and others who cannot win the big games).
The windows of opportunity in the NFL are small, so when all the stars start to align in Dec with all the variables such as your teams health, defense, RB, receivers despite our HC/OC, not to mention the most important position on the field, you basically have a magnifying glass on the QB position at all times.
If Dak wins a SB or even a NFC Championship, I think you see 95% of the naysayers in here gladly eating crow. Just my opinion.