Here's an excerpt from the writing of a man I agree with a great deal more than George Orwell:
C.S. Lewis on the abuse of the English language - News of the Day
I'm not entirely sure what you mean by "…many things you consider "deterioration" are actually parts of the language that have been around longer than the "proper" bits."
The meaning of a word can't be corrupted until there is a meaning to corrupt.
A phrase can't be hacked up into bits and boiled down to a series of letters which represent that phrase unless the phrase itself has a meaning to begin with.
Rules can't be broken if they don't exist.
You say that the English language is 'evolving', but I don't see how the alteration of meanings, abbreviated texts, simplistic words (and simplified concepts), poor grammar, misspellings, incorrect punctuation, and above all, a lack of concern for the dumbing-down of the language itself is an improvement in any way. It seems that, if anything, our language is 'de-evolving'.
Why change something merely for the sake of change? It's silly. If our speech and written word have worked well for us until now-and produced better results in the past-why attempt to change them?
I don't think that everybody LOL-ing and ROTFL-ing is especially useful in any way. U KWIM?