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Maybe with an agreement and coding. Is the blockchain consensus that should make the "rules" not the Exchange. Or should we be on the hands of a exchange to have an exchange listing hive?
I know this can sound a bit arrogant but is not my intention, what I mean is we (all hivers and the blockchain it self) must count more than an exchange and never more be in risc with a "stake attack" like it happened on Steem. Now it take 1 mouth to that "stake attack" but if for some reason happens we have to take some action, so maybe a pre agreement may be accepted by exchanges, don't know..
Anyway.. I'm comfortable with actual power down, just not sure if potential investors are.

You could give recognized exchange accounts other privileges in return for losing voting rights. E.g. listing them on the front page or in a wallet menu, or paying them interest.