With his age and pedigree (or lack thereof), I think it's pretty fair to claim Roden's ceiling is that of a league average OF. The nice thing about Roden is his ceiling and floor are likely close to each other. He has good bat to ball abilities, a good eye, but lacks premium power, defensive/baserunning utility, and he'll likely have to be platooned. Keep in mind that as good as he's looked, he's pretty much a consensus 45/45+/low end 50 FV prospect, and for a guy with his tools. league average is the likely outcome.
Think of Spencer Horwitz. That's pretty much Roden to a tee.