It's not just that. Heck, most people 100% supported Dak some time ago. It's just that it's been too long since there has been any progress.
Homers really love to ignore time. For whatever reason they don't care about the last 28 years and they don't care about the Cowboys play off performance since Dak took office.
I mean he's doing the exact same thing he's done in his inaugural season. Leading the team to a great regular season and early play off exit. Back then I supported him as the starting QB in the play offs even with Romo returning. Simply because he had earned it. And while of course disappointing I didn't have that much of a problem with the loss because I thought it was just the beginning. The beginning of something great.
Little did I know that that was his ceiling right there. He was and always will be the classical bus driver. He goes as far as the team goes. Can't push it one inch further.
So could he win more play off games this year? Sure, if all stars align for this team he could have his Nick Foles moment. But since that hasn't worked in 8 years I'm just ready for a new guy. Jerry held on for too long to Romo, now he's doing the same thing with Dak.
Dak fans love to say "The Cowboys sucked for 20 years before Dak arrived" which is true.
But that is such an incredibly weak thing to say, because you're essentially saying "Since the Cowboys sucked before Dak you should just accept that Dak sucks too like I have". Horrible mindset, but that's par for the course for player over team fans.
Also, anytime Dak fails the first line of defense is to bring up another QB that has failed in a similar situation. As if to say "See! This QB for another team failed too so Dak failing should be no big deal!" or "Well, THAT QB didn't play great against the 49ers, so it's okay that Dak didn't play great against them either."
You will see this stuff constantly, week after week, and failure after failure.
Then they will be shocked that Dak, the Cowboys QB, is getting talked about so much on a Dallas Cowboys message board for his failures while "QBs on other teams that have failed" aren't getting the same kind of criticism here.
The fan over team mindset, and the mental gymnastics it takes to be one, is something that is truly mind boggling.