Will proper spelling and grammar die in the future?

Over time, languages evolve in grammar and the characters used, as well as colloquialisms. For example the English language has dropped the ‘long s’, and Old English has many words that are unrecognisable to the average person. Many people even struggle with Middle English.

I think SMS language, as well as lazy spelling (for example ‘thru’ instead of ‘through’) may lead to a lack of language conventions. When I was in primary school, my teachers used to think spelling was not important, because it was harmful to contradict students.

So do you think language conventions such as proper spelling and grammar may disappear altogether?