Of course a lot of this is on Dak as well. He needs to be better and build a rapport with this new group of WRs and TEs. If he's as good as many make him out to be he has to find a way to elevate the play of his teammates. Other top QBs do it all the time. Even here in Dallas Romo had the ability to transform WRs who were typically categorized as JAGS into a quality threats in the passing game. Patrick Crayton, Miles Austin, Laurent Robinson, etc.
The coaching staff needs to be better as well. When practically all of your game day WRs gripe about the system being too predictable, you might want reevaluate your scheme. There were far too many instances where DBs were practically running the routes of the Cowboys receivers.