He will always have a high BABIP. He has zero or less power, while striking out about 15% of the time.
Having no power doesn't really improve your BABIP--the trend is actually in the opposite direction, according to the article below. Since strikeouts aren't in play, they also only impact your BABIP indirectly. There are a lot of things that do impact BABIP--taking pitches, walking, spraying to all parts of the field, hitting lots of line drives, and just being really fast, among others--but even if you do most of those moderately well a .387 BABIP is extremely high and likely to come down:
The actual standard deviation of hitter BABIP among players with at least 300 PA in a given season is about .031, but removing the fraction that could be attributed to luck using the same methods as the article I just referenced, and true hitter skill in BABIP should have a standard deviation of about .019. My model predicts about .018, indicating that I have isolated the most important aspects of BABIP.The NL average BABIP was .296 in 2011
, which would put Teajada's .387 BABIP in the 99.9999th percentile if it's his true talent. For comparison, Ichiro has a .351 career BABIP (probably a bit lower than the 99.8th percentile because he's in the AL and BABIP was higher on average in the 2000's). I think it's safe to say Ruben will regress some.