Let's say that is the case, will Sun allow an instant power down to these accounts that he is using to buy and power up steem as well? He claims he wants the fast power down for the exchange accounts only...

I have no clue what is going to happen but I'm more on pessimistic side.
It's all speculations.

Of course, no one knows for sure outside of his camp. His plans for steem/steemit after he does his hardfork is likely the biggest indicator of whether this steem chain will continue to have value or not going forward...

Sunny's Tron is not doing very good though.

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