Well I can appreciate your view, but there are always detractors against the current starting quarterback, I remember years ago some fans wanting the Cowboys to stick with Morton instead of Staubach, for various reasons - he's too green, he runs too much, it's a veteran team and we need to stick with the more seasoned quarterback, etc. Some fans aren't satisfied with anything less than the top player at a position. (Not saying that's you)
But I don't agree that we're not going to learn anything new about Dak, I was never a fan of Wade Wilson or Scott Linehan, in my opinion neither was good enough at their position. Don't really know about Moore and Kitna, just think trying something new is way past due.
Though I do think this is the year Dak has to show improvement, barring tons of offensive player injuries/missed games, if he stays the same, then it's time to look at plan B...