I would argue the fans lost more when Jerry decided to devote unusually large resources to less premium positions like 4-3 linebackers and interior offensive linemen and running backs. To say nothing of the Lawrence extension, which presumed he would be an elite pass-rusher for years to come even though he'd only ever been elite for half of a season one time.
The fans don't lose if we have to pay our QB what the market bears.
In short, if you are lucky enough to find a good QB, at some point you're going to pay an uncomfortably huge extension to keep them. It's the cost of doing business. Unless you want to risk plunging yourself back into the dark era of not having a QB. Where you're throwing darts at a dartboard in the draft every year or two, and you're signing projects and lottery tickets and guys in their late 30's or 40's. We didn't like it the last time we went that route, but fans who irrationally hate Dak are rock-hard at the idea.
Because of the nature of the prices going up (the cap has exploded, but teams still try to roster as many guys making peanuts as possible, which means most of the money gets shoved towards the upper end of the roster), it means you sign a guy to as long a deal as he'll agree to as early as possible. It starts out looking like a huge deal. And then a few years later, seemingly worse quarterbacks are getting even bigger paydays just by virtue of their extension coming later once the market bar had been raised and the cap had risen.
It wouldn't have been unthinkable for the Packers to sign Rodgers to a huge deal, and then wake up one day a handful of years later to find that the Lions got stuck paying more to Stafford and the Bears got stuck paying similar to Cutler and the Vikings are flirting with paying more to a generic free agent (just because these guys all get more when they hit the open market before they're old men, because that's what the market will bear). It wouldn't have meant they were better than him, just that the confluence of events conspired to give them more favorable circumstances to hit the jackpot.
Maybe one of these days, a team will go all Moneyball on everyone and decide that they're going to maintain a financial advantage by going cheap at QB every year no matter how good a QB they draft, and using all that saved money to surround the QB with the best team possible. But I don't think we'll be that team.