Pretty sure that 99% doesn't want to fork just to delay the halfing.
That is why the "proof" that "a majoritary mining cartel can't change the protocol" is subjective.
I don't know whether the miners will try to delay the halving (or do some other "sacrilege"). But, if they were to try, my estimate is that less than 10% of the bitcoiners would be furiously opposed to the halving delay, the other 90% will not care, and only the 4-5 miners with 60% of the hashpower will be in favor. Then these miners will do it anyway; and 99.9% of the bitcoiners will accept the change, including most of those who swore that they would abandon bitcoin if that happened. Because their greed will speak louder than their ideology.
Bitcoiners are incredibly easy to fool if they are told what they want to hear. They believe that adoption is booming, that the exponential price trend is built-in, that Satoshi was an anarcho-libertarian, that governments cannot stop bitcoin, that Greece may adopt it, that the banks are secretly investing in it, that sidechains will solve all problems of the protocol, that Wall Street whales are holding the price down, that China is irrelevant, that Willy created the last bubble...
If Antonopoulos tells everybody that postponing the halving will not delay the Apotheosis, and Roger Ver posts a video where he promises that it will be the first and last change to the protocol, and Gavin tweets that he supports the change, and Coindesk and Bloomberg and Forbes and the WSJ assert that it will be a positive development for bitcoin, then 90% of the bitcoiners will believe that it is a good thing, and the rest will pretend to believe it in order to preserve the value of their coins.
Huh
so there's incentive for miners to delay the halving, and if they decide to do it they will do it anyway and be successful 
Do you seriously think that there's over a 50% chance that the halving will be delayed??
