If nothing else, the very fact that he's wearing the Captain America uniform will force him to straighten up. As Jack pointed out, he was ready to kill Frank for bringing his sociopathic methods to Captain America's name. No way he'd just turn around and bring his own dirty, black ops methods to the Cap name. He'd change his whole style around and strive to be as much like Steve as he's capable of being, and he'd probably come out closer to the old Bucky in the end as a result.
But like I said, once the uniform comes off and he's just James Barnes again, I see him being as reckless and impetuous and out-of-control as he is now, at least at first.