Dak probably would have signed the deal last year if it wasn't for those 1st 3 games where he played lights out and his agent decided to up the anti.Then Dak went 5-8 after that, not looking as good. Yes, it's a team sport, but why would you spend such a huge % of your cap on a QB who did not lift them up beyond 5-8 for the rest of the season.
The FO then made a mistake giving Dak the exclusive tag vs the transitional, probably as an act of good faith, then Dak's and his team blew it up in their face. That is when the FO and coaches probably started thinking, can we do this without Dak and save a bunch? Maybe Dak's rookie year is even working against him now, where you see low round draft picks coming into the league and showing success, now we have Dalton as insurance.
If both side don't come to a mutual agreement in a couple of days, I can see a couple of possibilities.
1. Don't be shocked if Dak get traded before the season starts.
2. If he plays through the tag and we win the superbowl, or at least get there he gets paid on his terms.
3. If he doesn't get to the NFCCG and have a top 10 year, but not top 3 he will get the transitional tag next year.
4. If he doesn't get to the NFCCG and have a top 10 year, but not top 3 he will sign a more team friendly deal.