I don't think of myself as an Iranian homeland proponent, but I'll answer anyway.
Domesticated camels seem relatively recent even in the Near East.
Topics like this, which aren't really political, are covered relatively well in Wiki, I think.
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Dromedaries may have first been domesticated by humans in Somalia and southern Arabia, around 3,000 BC, the Bactrian in central Asia around 2,500 BC,[13][62][63][64] as at Shar-i Sokhta (also known as the Burnt City), Iran.[65]"
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Martin Heide's 2010 work on the domestication of the camel tentatively concludes that the bactrian camel was domesticated by at least the middle of the third millennium somewhere east of the Zagros Mountains, then moving into Mesopotamia, and suggests that mentions of camels "in the patriarchal narratives may refer, at least in some places, to the Bactrian camel." while noting that the camel is not mentioned in relationship to Canaan.[68]"
https://en.wikipedia.org/wiki/Camel
Another type didn't reach Israel until around 930 BC, probably introduced through Egypt as part of the copper trade.
http://www.nytimes.com/2014/02/11/science/camels-had-no-business-in-genesis.html
If they were domesticated around 2500 BC they were in the area earlier, but do we know they were in the Armenian highlands before that?
I don't think the choice is between some lowland grain farmers from an area with a Mediterranean climate and steppe foragers. It's whether there's a possibility that the language might have arisen among herders living in places like the Armenian Highlands and/or the Iranian plateau. I asked the original question about what differences there might be between areas just north of the Black Sea and the Caucasus and those other areas in terms of flora and fauna because I'm by no means an expert in this topic and wondered if someone else might have more detailed information.
Ed. Does anyone know what it's like in adjacent areas of Turkmenistan?