The arguments of last two posts seem to indicate that the future of human languages is quite bleak. There is however a silver lining in the black clouds.
As I see it now, the previous arguments fail if you want to apply them to things related to art. I am using this word in the broad sense of meaning most of the creative activities. Now in art, there is little role of "building on top". Surely to become a good writer, as anybody would tell you, you must read a lot or to produce good music, it helps to listen to a lot of good music. It helps but again whenever you start, you are at ground zero. You have to start on your own and buildup. The fact that Ghalib wrote very good sher-o-shayari, makes it no easy or no less creative for a new shayaar to start writing. Similarly Picasso's paintings might have influenced a lot of painters but each and every one of their works is a result of a journey they did alone.
Another point is that I think most of the art is very personal. A true artist creates and lets the creation go but that in way takes away the individuality that resides in those creations. And so something like "collective feelings" won't do. It just doesn't fit my concept of creativity as of now.
Now the problem of channel remains true even in this case. You will find no artist who will say that he has been able to convey exactly what he wanted in his creation. Because if he had been able to, there will be little motivation for that next one. However this vagueness is the biggest asset that languages and other mediums of artistic expressions have over a better channel. They allow the artist to keep his individuality and still give enough to the world. Naked feelings are too crude to be conveyed around. And anyway, we have always had that means of communication called inspiration that sciences lack so much. I think this combinations is very good for the purpose at hand.
Someday in retrospect, it will seem ironical that the first ones to dump languages were the sciences whom it served beautifully always and it took arts to save it and nurture it who always complained about its inadequacy for their purposes.