I feel that most people instinctively assume that some institution, e.g. the government or the dictionary publishers are the authority on what constitutes "correct language". It's important to emphasize that language (included spelling) is something that develops organically and that the role of these institutions is just to capture the status quo. At least that should be the case in free societies. Language is power…
Indeed, dictionaries and governments are just writing down what's already happening in the language. In a way language is one of the only truly democratic institutions. We all vote for new words and new pronunciations by using them or not using them. The collective action of all these choices is the language.
And there is no true way to "vote with your feet" if you get punished for violating the official orthography.
Not to mention other sources of non-organic language change, like e.g. suppressing dia- or sociolects, but I also don't want to delve (hehe) too far. :P