A committee member provided the following comment:
While the study of Proto-Indo-European is a noble task, it is not fitting for a Wikipedia project. Rejected per the policy, specifically point 4 under "Requisites for eligibility". Jon Harald Søby (talk) 09:15, 22 April 2016 (UTC)
The community needs to develop an active test project; it must remain active until approval (automated statistics, recent changes). It is generally considered active if the analysis lists at least three active, not-grayed-out editors listed in the sections for the previous few months.
"Wikipedia talk" (the discussion namespace of the project namespace)
Default is "no". Preferably, files should be uploaded to Commons.
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Proto-Indo-European (PIE) is the linguistic reconstruction of the common ancestor of the Indo-European laguages. PIE was the first proposed proto-language to be widely accepted by linguists. There are several competing hypotheses about when and where PIE was spoken. The Kurgan hypothesis is "the single most popular" model, wherein the bearers of the Kurgan culture of the Pontic-Caspian Steppe are the hypothesized speakers of the reconstructed Proto-Indo-European language. It was spoken by Proto-Indo-Europeans. It will be very useful for linguists and students to teach or learn and there is many people willing to help, also, it will be a place for Indo-Europeanists to compare Indo-European languages --Guillermo2149 (talk) 14:20, 25 February 2016 (UTC)
Strongly Oppose. Firstly, PIE has not yet been reconstructed to any respectable extent, and that's why it isn't used widely even among linguists. Secondly, even if we assume that PIE has already been reconstructed and understood well enough, there still will be place for speculations due to possibility of discovering previously unknown extinct IE languages which can drastically change our understanding of PIE. 18.104.22.168 19:52, 11 April 2016 (UTC)
I propose that if Indo-European is to have a Wikipedia, it needs to be Late-Indo-European. The one used by Academia Prisca  of Fernando López-Menchero. To which, "A Grammar of Modern Indo-European" is a complete reference guide to a living Indo-European language. Having a Wikipedia in this form of the language would help people understand Indo-European culture. Late-Indo-European is readable and represents a langauge that would be both written and spoken, whereas larnygeal PIE is not really a langauge you would write down. For example, Wiḱípḗdyā Léudherom Énqeqlopautyom is readable. Suḱléwos of the Euxine Steppe (talk) 02:03, 3 October 2017 (UTC)