Calhoun doesn't need to become a Grant Hill type point forward - he just needs to tighten it up. He needs to feel the defensive pressure and know how to protect the ball. It wasn't even that he lost the ball a lot this year, it was just really easy to take it from him sometimes. He has a ways to go, but we can expect a little more savviness at the least.
But there's a long line of UConn 3s that have gotten better at their ball handling and perimeter skills, going back to Scott Burrell, who was basically an undersized 4 as a freshman who moved his game out as his career went on. Donny Marshall, Ray Allen, Caron Butler, Rudy Gay - all were a bit shaky or unpolished putting the ball on the deck as freshmen and got better. Donyell became a much more polished perimeter player, although more in the sense of being more fluid coming off screens than in becoming a ball handling threat. Rip was pretty polished from the get go (he played point guard in that Kansas game), and Sticks never really got there - he was either spot up or work off the dribble in the post. Ollie and Kemba became much better shooters - AJ too (with the caveat that he was very rusty his first year). The Freeman at the 3 experiment didn't really work, but he did get better handling the ball and facing the basket - I think the larger problem that year was that Freeman was a downgrade from Rip at the 3, and Saunders was also a downgrade from Freeman at the 4.
Over time, we tend to remember the finished product and forget the process in getting there of smoothing out the edges.