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Maybe we can achieve an agreement with binance and other involved exchanges in order to spend their vote on previous "real" witnesses in order to regain control over the blockchain again.

Yeah, that would be great. But I am 99% sure that this is not gonna happen.
Right now they are actively denying that they knew of the powerup. They are stating they just accepted another fork which happens from time to time. Yeah, sure...

You'd trust obligors on an agreement after they defrauded their customers and fiduciary trust?

Not me.