Blockchain analysis has proven to be useful to exploit hacks and money laundering..
See here for the MtGox Hack:   http://blog.wizsec.jp/2017/07/breaking-open-mtgox-1.html
From this point of view it could be a deterrent to this kind of activities, in the other hand I strongly believe that we need privacy-oriented crypto. Maybe not for everyday use or business transparency but for c2c transactions and privacy focused comunities it is a must.