Why would I celebrate it, Holderlin? When I joined the amateur community I was astonished to find that the PC steppe hypothesis had become such a hotly and bitterly contested idea. This is no reflection on you personally, I assure you, but it has seemed to me that part of the problem is that the uncritical and sometimes dishonest championship of it by racists on various racist anthroflora and blogs has "poisoned the well". Truthfully, it has always had that aspect, ever since it was proposed in Germany in the late 19th century. Some of the resistance is probably due to that. I suppose certain "national" groups have their own ax to grind. Personally, I don't care if it all came from the pen of Hitler and Goebbels. I'm only interested in whether its accurate.
That the steppe was the vector for the branches of PIE which led to Balto-Slavic and Germanic seems to be settled. The same is probably true for Celtic/Italic. The Anatolian languages are a puzzle and always have been, and so is the actual source of Indo-European for anyone who takes a balanced approach. Grigoriev and Ivanov have to be read as well as Anthony. No less a source than the dean of Indo- European studies, Mallory, has always been aware of that, but the amateur community hasn't paid any attention.
My personal opinion, to the extent anybody cares, is that no one has yet come up with a totally satisfactory solution to the actual "origin" question. Anatolian is a big part of the puzzle, but so is the presence of agricultural vocabulary.
See:
http://www.jolr.ru/files/(112)jlr2013-9(145-154).pdf