Does anyone else think that the English language is deteriorating?

It seems to me that the written language is being eaten away by texting, emails and messaging where shortened versions or symbols for words are the norm. (<----- like that) And with the influx of so many people for whom English is their second language, the intermix is creating many more sub-English dialects in the different communities around the country. In some cases the subtle change of speech is deliberate as in slang and street talk and is used to create a seperate identity from the rest of us. Is this a good thing? Or should we all at least be able to speak clear English that is understandable to all?