I have to disagree with this most emphatically. No individual is an island--particularly in the workplace. One must be able to communicate effectively to be a productive part of any team. If one cannot write or speak well, they cannot communicate well.You don't need good spelling and gammer for many jobs from programming to surgery. That you think this should somehow be a barrier to entry is rather deplorable.
I see evidence of this on a daily basis on forums such as this one. Somebody makes a statement using incorrect words or poor grammar and is misinterpreted thereby. Or somebody else makes a statement using correct words and grammar, but using words and terminology with which others are... unfamiliar, shall we say?, others assume they know what was meant, and we're off to the races.
A good example is the article resulting in this thread. Does Apple really mean "equity?" Or do they really mean equality? Because the two words mean entirely different things. I can get behind the latter, equality, 100% and without reservation. The former is abhorrent for a number of reasons, and I'll have no part in it.