Here is Tavarez's BABIP chart from fangraphs.
His almost acceptable 2007 season was driven by a .371 BABIP, a season so lucky that it will almost certainly never be duplicated again.
What can we expect from Tavarez with average luck? Well it just so happens that last year his BABIP was almost exactly league average, .298. Last year Tavarez was almost as much an offensive black hole as Patterson, but while Patterson was extremely BABIP unlucky last year (
.217, yikes), Tavarez's 2008 is about what we can expect from him on average.
One season, Tavarez is going to be BABIP unlucky, something he has avoided up to this point. In that year, his offensive sucktitude will almost certainly result in some kind of rift in the space-time continuum.