The Indo-European problem is a complex one, combining linguistic and archaeological evidence. In linguistics Gamkrelidze and Ivanov have suggested a system and a fundamental solution. Convincing linguistic models uniquely localising the Indo-European homeland in the Balkans, or even in the North Pontic area or Central Europe, are lacking. Often criticism of Gamkrelidze and Ivanov has been reduced to no more than a statement that archaeological evidence in favour of it is absent. As we see, this does not correspond to reality (and, by the way, did not correspond to reality before the publication of this book). There are a number of facts to prove the connections of North Eurasian and European cultures with the Near East, whilst convincing examples to demonstrate the reverse connections do not now exist. There is a purely historiographic tradition, not substantiated by facts. For the long years this tradition flourished it proved impossible to flesh it out with arguments, although skilled scholars attempted to do so. Therefore, hypotheses about the northern origin of the Indo-Europeans have practically nothing which can be used today in support, either linguistic or archaeological. The archaeological model suggested here is not complete in many respects. Many parallels may raise doubts, as it has not always been possible to back them up with completely identical artefacts. But in the consideration of distant migrations and subsequent cultural transformations, such complete similarity may be wanting.Halafian culture as the archaeological manifestation of the Proto-Indo-European community (picture from Wikipedia on the right).
For reasons of my own (i.e., finding the hiding place of the "West Asian" autosomal component which I believe was introduced to Europe by Indo-Europeans) it might be worth seeking a more "eastern" PIE homeland.
In any case it would be wonderful to get some archaeogenetic data from the Near East. Irrespective of one's opinion on the IE problem, most everyone would agree that this is a critical region for understanding the prehistory of Eurasia.