In reply to:

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But colloquialisms creep into common use all the time. The Internet has its own jargon, and some of those things will find their way into the language over time too. What's so terrible about that?

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Colloquialisms are fine and they do creep into languages all the time. They creep in even with rather strict enforcement and education dealing with language norms. On the internet, outside of a handful of forums like this one, there is little enforcement at all of rules of grammar. (At least without the flaming you mentioned above which is usually more about meanness than grammar.) The open acceptance of radically altered grammar could serve as a catalyst to this change. Since the grammatical and spelling changes normal to the internet are largely utilitarian, it would in my opinion greatly vandalize what is capable of beauty.

By the way, my spell check caught 3 misspelled words in this post.