That's a bit of an illusion though. In theory miners have a choice, but until there is an alternative with some kind of authority and following, then they are i

That's a bit of an illusion though. In theory miners have a choice, but until there is an alternative with some kind of authority and following, then they are in danger of losing money by not using the new version of the de facto client which most will use unless the devs go as far as to hardcore the transfer of all funds to their own address. Since miners are in for the money, usually they don't care about anything else as we see from other cryptocurrencies. Also, don't mistake consensus of miners to consensus of users of the network, which is the biggest problem with most cryptocurrencies (BTS did well on that part).