I'm not saying the Cowboys will go grab another QB, I agree with you that in their situation it's not realistic, I'm just saying that its not the 90s in terms of being able to find alternate QB options and teams have been open to getting creative. For the Cowboys It's Lance showing potential, something crazy happening during the draft (which is probably too late anyways) or bust on moving on from Dak. For that reason it's possible, but I do think still the most likely scenario is a Dak extension. I just don't think the moving on from Dak conversations should be instantly shut down. It's probably a 10% chance, but that's still a reasonable chance of it actually happening.
Any my bad on the 16 team comment, I misunderstood. To play devils advocate though with half the league searching for a QB you do open the possibility of a Dak trade, although again I would say is 100% dependent upon Lance.