Hello and thank you for this fantastic post.

I am the founder of Bravenewcoin.com.
We have a 'Market-Cap' page and have long ago decided to display market capitalization based on total supply, not 'available' supply.
This is because, Ripple being a good example, could deploy all printed but not-yet-circulated XRP at any moment.
There is also no programmatic way to track new amounts of withheld coin being moved from private stores into the available supply.

Please see bravenewcoin.com/market-cap. We also default display by order of volume traded last 24 hours, because there is plenty of shitcoins which trade $500 but are in the 'top 20' by market cap.

Your point on perpetual blockchains: Steem and many other coins will create x amount of new coins at a set rate each year (unlike bitcoin where total supply of 21m is hard-coded).
I view this as a 'perpetual stock split' more than anything. A regular stock-split in the Crypto space is what has just happened with Ethereum. Market cap for ethereum should be calculated on the total supply of the longest chain x the average in value between ETH & ETC. Effectively creating two seperate share types. But as you said Stocks are 'not quite right' as a comparison and we are still defining terminology as this is a completely new Asset-Class.

I welcome any submissions for a formal guideline of best practices or standardizing naming conventions:
[email protected]