Interesting idea, although it is questionable whether micro black holes would have had time to form prior to the inflationary epoch, that is, in the first 10^-34 seconds. But if they did, then as Kwalish pointed out, the sudden hyper inflation would have expanded the micro black holes to enormous proportions, and I would think that they would no longer be dense enough to be black holes anymore. The tiny "singularity" they once had might possibly expand to the size of a "seed" around which subsequent dark matter structure could begin to form.... But baryonic structure would have to wait another quarter million years for the temperature to drop enough to allow any baryonic structures to coalesce.

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