On the topic of BABIP, the Sox team BABIP is currently .347. There have only ever been two teams that have gone an entire season with a BABIP over .330. More recently, the highest team BABIP over a season is .327, IIRC. So yes, the offense is going to regress. However, the regression should not be too significant. In other words, this offense will regress to being merely very good instead of being historically good.