My alternative is to sign a much cheaper QB and have the same success that we have with Dak while looking for an actual QB that's worth that top pay. As I said you can lead the NFL in INTs and fail in the playoffs for much cheaper than you're paying Dak.
I don't think it's as difficult as some want to make it. The only thing that makes it difficult is hitching your wagons to a QB that needs a ton of help like the Cowboys have done for the past 15 years with Dak and Romo. Even then if you want to you can be on the hunt for your future QB. The last time the Cowboys took the QB position seriously was when they drafted Aikman.
I use the Rams as an example all the time. If Goff played for the Cowboys and led us to the Super Bowl like he did the Rams he would've been our QB for the next 15 years. Instead, the Rams knew he was a weak link, moved on, traded for Stafford, and instantly won the Super Bowl. Jerry would've NEVER moved on from that. That's an example of a team making a trade to get a missing piece.
Here's the other route the Cowboys refuse to do.... The Cowboys would've never traded up to draft Mahomes in a year that Alex Smith led them to the playoffs. Jerry and Co would have been 100% happy with that and would think they just need to put more help around Smith refusing to see that Smith is the weakness here. That's an example of a team taking a chance and drafting a QB, letting him sit a year, and then giving him the chance.
Then you have the Bucs and Brady. The Bucs moved on from Winston and signed Brady and instantly won the Super Bowl. The Cowboys could've signed Brady, but they didn't, because they didn't want to risk it or move on from Dak. That's an example of a team signing a high level veteran QB and it changing the whole franchise.
The last 3 Super Bowl champs have been teams that were taking the QB position seriously and either draft, sign, or trade for a QB while moving on from a weak link at the position.
So, it's simple really to me. You draft, sign, or trade for a QB. If it doesn't work out then oh well, because it's not working out with Dak either, but you have to take the risks to get the rewards.
Do. Not. Extend. Him.