I've been looking at billy's stats and i figured out this: on average billy has on average 179 hits per season but has 806 hits. So combining the stats in about 13 years billy will have 3000 hits if he keeps things up. He averages 18 home runs per season and 80 home runs. Combining the stats he will have 308 home runs in 13 more seasons and 500 in 24. He has 195 doubles and averages 43 per season. I combined these and in 13 seasons he will have 774 doubles if he keeps things up (and of course lasts that long). So When billy hits 38 and if he is still playing and playing at his form today He will have the stats of a hall of farmer.
Currently his most similar player is reggie jefferson and john olerud. The only hall of famer on any of his lists is carl yastrzemski, fifth on his list of most similar batters through age 25 seasons. Though the only thing he has lead the league in is double plays grounded into.