Indo European roots

This is one of those subjects where one side has the upper hand for a while and then another point of view prevails. At http://dienekes.blogspot.co.uk/search?updated-min=2015-01300 … an anthropology blog which looks interesting, reviews a new paper that claims Indo European roots were on the steppes from around 4500BC – moving into the  Balkans and subsequently into Anatolia. The blog author obviously favours the alternative view that Indo European languages were disseminated by early farmers – which moved through Anatolia into the Balkans (the opposite route of migration).