I don't agree.
I think standards, precision and consistency in communication is important. I'm not a great speller, but I at least try to make a pretty good attempt at it especially when writing to/for others. I have to write a fair amount of technical'stuff' to people whose second language is English, so accuraccy is important. What's scary is that their command of our language is often better than many of our own.
Whilst I don't doubt that many people have dyslexic tendancies, It's also too easy for the yoof of today to be lazy and use text-speak/sloppy spelling and grammar because they're not corrected. We need more pedantry not less