Who said it was impossible to draft a QB and win? All the teams you mentioned were losing teams the year before, thus they picked high enough to draft a top college QB. I asked you for a realistic alternative as to what the Cowboys, which are not currently a losing team, should do. None of the teams you listed are in comparable situations to Dallas. Similarly, none of them are even remotely close to being contenders except maybe New England - and that has very little to do with who their QB is. The only way any of these scenarios would apply to Dallas is if you suggest we should tank for X amount of years and hopefully be bad enough to be in the right spot to draft a top college QB.
It's funny you bring up Denver because they are, consequently, a great model for why it's not so easy to just "draft a QB" and call it a day. Denver drafted three QB's in either the first or second round within the last decade. All three did not/have not panned out and they'll likely be in the market for a QB once again next year. You can literally waste a decade of your franchise's existence cycling through different young QB's trying to hit on one.
See, this is where the anti-Dak scenarios always fall apart. I ask you for a realistic alternative and you throw out a pie-in-the-sky trade scenario that would have never happened in a million years. Again, I'm asking what realistically Dallas should have done to move on from Dak. This is not realistic. This is a Madden trade.
Here's the second place where these anti-Dak pie-in-the-sky scenarios always come crumbling down. You don't seem to understand that in your made-up Dak/Herbert trade, that one move sets off a chain reaction of other moves and drastically changes the trajectory of everything that happens after it. So if we had made your mythical trade, and started Herbert all 16 games last year instead of Dalton/Dinucci/Gilbert for most of the season, we likely finish one or two games better than 6-10 and likely aren't in any position to draft Parsons. So again, realistically here, you're saying you would rather have Herbert than Dak/Lamb/Parsons. Bold statement, but all I can do is laugh.