Interesting piece of speculation, for sure!
Since redfish-minnows-dolphins-orcas-whales are based on vests rather than dollar amounts, and the price of Steem might end up somewhere in the multiple $100's, I'm guessing the vast majority will be "redfish," with a smaller multiple (maybe 10-20x?) of Minnows than we have now, maybe 2-3x more dophins and not that many more Orcas and Whales, although a Whale account would likely have a fiat equivalent value of $10's of millions. Somehow, it seems to me the limiting factor will always be the total supply of Steem tokens, which is increasing, but at a decreasing inflation rate.
At $300 Steem, even "buying" a dolphinhood from scratch would be a $1.5 million proposition in fiat.
The mind boggles!
=^..^=