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Oh, I thought it was about tagging the communities and merging them based on those tags. Are you suggesting tagging the posts instead, and displaying all posts tagged the same from all communities across all federated instances in the same location?
But this can already be accomplished with the search feature. You only need to select ‘Local’ or ‘All’ and search for a word. People shouldn’t be forced to hashtag every post, so the result would be the same as it is now.
There could be conflicts between hashtags, as a hashtag for one community may not have the same meaning for another community. This would result in mixing topics and potential confusion.