Same dangers as always
I think predictive analytics makes a lot of sense. It has huge potential to not only help businesses perform better, but also offer up some really interesting insight into how we do things as a species and on an individual level.
That said, all data, whether it's used to analyse the past, present, or future, is only as useful as the one making the interpretation. We must be wary to rely too much on raw data, as it can be misleading if you look at it looking for a particular outcome.