I think it's something teams have to work around and especially have to draft well, and have a strong coaching staff. But I don't think it's a death knell for being a contender.
That said, I do wish Dak would have left money on the table and was willing to do a longer term deal to give them more flexibility to move money around. He definitely didn't do us any favors.
The biggest issue is if you're giving that high of a cap percentage to your QB, he better be worth it. So basically it again comes down to Dak hasn't been good enough.