Is Howard good enough to be a capable starter at RT - nobody knows at this point. But he is young and will get better with experience.
We do know that after 9 years, Hunter is as good as he'll ever get. And regardless of his physical skills (which most say are impressive) the guy's confidence is now shot. Furthermore there's a target on his back so other teams will be going after him, making the situation even worse. As a consequence I'd like to see him as an (expensive) backup OG this season.