Besides the fact that any changes in bitcoin must be approved by near 100% of its users (this includes both miners AND users), otherwise you just end up with a new altcoin and the old bitcoin running side by side, note the text in my signature, which was my thought, put much more eloquantly into words by our forum user NewLiberty
"Perhaps no where else in modern society is the threat of Democracy devolving into Ochlocracy given so dangerous an incentive as it is with Bitcoin. If there is any politics in Bitcoin, it would be this lesson: the necessity of mustering the individuals to prevent this Tyranny of the Majority against the rights of all to the freedom of transaction." - NewLiberty
The meaning is that in bitcoin, a 51% mining majority is seen as an attack, unimagitively called "The 51% attack." This is quite literally "democracy, where majority votes, is an attack." This idea may actually influence people's psychology to consider many other majority-rule democracy things as an "attack." Possibly in the same way that peer-to-peer music/movie file downloading has influenced people to believe that breaking copyright isn't actually stealing.