I suppose we have a misunderstanding with regard to the phrase "subvert 99% of the mining power" as it was used in an earlier posting. I understand it as "I own 99% of the mining power". It looks like you understand it as "99% of the miners are in my pool and they might also leave my pool".
Yeah well that's probably because "subvert" doesn't mean anything close to "own." Now you only need 99x the current mining power to pull off this attack.
I agree completely: If "my" 99% of mining power just is derived from miners in "my" pool - the miners might notice and might leave my pool. And still, even in this situation: Would they do so if they realize that their payoffs are larger in my version of the algorithm? They are getting 51 BTC (or 500 BTC) in my version. Is it tempting to move from a 500 BTC per block operation to a 50 BTC per block operation? ;-)
The payoffs are 0 when nobody accepts those BTC. This is getting silly.