I'm not Kaz but I'll offer my first impressions all the same. As I see it your question is just:
Will we transcend language and numbers in the future? ... would symbols be obsolete too?
As social animals humans will always feel the need to communicate (I believe), that communication is currently through written word, speech and body language. These can all be misread and so, in the event a more efficient method arises, I believe they could die out. Some direct transfer of meaning or imagination would surpass them....but this doesn't mean we are living in some bleak future, the pictures and meanings in our minds can be more expressive and colourful than those we can express through a limited selection of words or brush strokes.
If the tech exists for us to record someone's meanings in order to project them as the mental equivalent of a film or book then logos could also be projected and with a deeper meaning behind them.
There would be no fun in art or drawing or making basic symbols. How would any product or tech have a logo if there's only mind communication? That sounds depressing.
I think perhaps we need to consider the opportunities that this evolution of communication presents, rather than what is lost. We no longer carve words into stone as standard but perhaps at some point someone was mourning this loss in our transition to paper.