Should Gondor have given Calenardhon to the Dunlendings?

[Inziladun]

Originally Posted by Selmo

It would not matter to the Gondorians whether the Dunlendings and the Rohirrim were related or not, so long as they could persuade themselves that the useful group were almost their equals and the other group were not.

Truth and racism are rarely connected.
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It wasn't only a racial factor that was involved. In my opinion, that was only a minor "plus". It had more to do with aiding and rewarding a people who had themselves indicated they would be friendly and loyal to Gondor. The Éothéod had also outgrown their lands in the North, and Cirion had that in mind. Did Dunland have that last problem?

And there were personal issues as well.

Yet beyond wisdom and policy both Cirion and Eorl were moved at that time by the great friendship that bound their people together, and by the love that was between them as true men. On the part of Cirion the love was that of a wise father, old in the cares of the world, for a son in the strength and hope of his youth; while in Cirion Eorl saw the highest and noblest man of the world that he knew, and the wisest, on whom sat the majesty of the Kings of Men long ago.

Unfinished Tales Cirion and Eorl

So, if the theory here is that Cirion made a conscious decision to exclude the Dunlendings because of their race, I think that is a categorical "no". The more accurate observation would be that the Dunlendings had never put themselves forward as friends of Gondor, and as a result would simply not have been in Cirion's mind as settlers for Calenardhon.