I always took the line as "I'm afraid he'll turn into a reckless, carefree, adventure seeker like his father", as opposed to Owen's dependable, sensible farmer archetype.
Same here, that's what I assumed. Also, that Anakin's reckless self-confidence was the reason why he was no longer around, ie, that's what got him killed. I never for one instant suspected any connection to Darth Vader or the bad guys in general.