I agree with your point about QB's to a degree. The team definitely should have been drafting QB's along the way hoping to groom someone for when Romo was too old, and fortunately they got Dak before the position hit rock bottom, but when Romo was younger, like Dak, they couldn't spend top draft picks on what is certainly going to be a backup situation. There are too many other areas a team needs to address to use that kind of draft capital on a backup.
I think QB's are already held to a higher degree of responsibility than other positions, so I think what you are suggesting on that front is already the case. That's why QB's across the NFL are the highest paid players.
As far as QB's forcing these kinds of deals, these kinds of deals aren't just on the QB, they are also on the teams who have been willing to cough up big money for QB's. At it's core, it's simply supply and demand economics. Teams don't think there are a lot of high quality QBs to go around, so they are willing to compete against each other for the rights to the one's they believe are quality QB's, and that drives up the price.
As for where we are at this point, I don't even go there because there are so many unsubstantiated reports, and there have been for a long time, so I just don't bite on it. I doubt very much Dak is expecting $40 million per year with guarantees that blow significantly past what Goff, Wentz and Wilson signed for, but I can't claim to know. I agree with you, however, that if it proves that he is asking for something like that it would put him in a bad light.
