Even with only one year of coordinating experience, and with that one season not being particularly good, Joseph was considered to be a hot commodity on the coaching carousel this offseason. Joseph has been highly regarded throughout league circles for his leadership abilities as well as his intelligence and you could make some comparisons between him and another veteran defensive backs coach with only one year of experience before getting his first head coaching gig, Mike Tomlin.
But while I think Joseph can become a good head coach, I think the Broncos may have missed out in not hiring Kyle Shanahan. The offense was a mess this season as the quarterback play left a lot to be desired between Trevor Siemian and rookie Paxton Lynch and thus bringing in a talented quarterbacks coach and playcaller in Shanahan, who runs a pretty similar offense to Kubiak as well as Kubiak's mentor, and Kyle's father, Mike Shanahan, would have made a lot of sense.
Therefore, it will be key to see how Joseph fills out his coaching staff. Mike McCoy would be a good fit to come back to the Broncos as the offensive coordinator considering how well his prior stint went (don't forget that Tim Tebow has his moment in the sun with McCoy calling plays). The defense is still really strong with this team but will they be as good with Wade Phillips not returning as the coordinator?
Joseph is highly regarded with many thinking that he could do good work as a head coach. Plus, he is not in a bad situation given that this team is only a season away from being Super Bowl champions. That said, it seems safe to say that his tenure will be defined by what he gets from the quarterback position while he has this tremendous defense to work with.