The rate of DNA testing for genealogy has actually slowed significantly in the past year. Also, Ancestry's model of "pay to see other users' trees" and "pay to see the sources" is a loser in the long run. Not only are there more and better free trees at FamilySearch, Wikitree, and Geni--there are more and more free primary sources coming online all the time. The Ancestry "pay per month" model won't be able to compete. I reckon that Blackstone, who invest mostly in healthcare, will attempt to leverage Ancestry DNA. This acquisition may signal the beginnings of a shift away from family history and towards DNA-based healthcare services. In this realm, they'll have some catching up to do to compete with 23&Me and myHeritage (who acquired Promethease last year). On the other hand, Ancestry does have the biggest DNA database.