I know this is way off but I'm not worried about Dak with this O line. When/if this O line goes downhill is when I think he'll really be tested.
Don't get me wrong, he did everything right and looked awesome as a rookie but I think most, not all, NFL qb's would look good with that O line along with Dez, Witten, Beasley and Zeke.
He wouldn't have had near the success with anything less. For example, if he was playing behind the Gnats O line we would probably still have Romo because Dak wouldn't have looked so good.
Just my opinion but we're good to go for at least the next few years which is fine by me.