The thing is, that certain glasses are shaped to direct certain wines to certain parts of the tongue. This is done to emphasize certain flavor characteristics. Also, because you have your nose in the glass in more conventional glasses, it allows the bouquet to contribute to the overall enjoyment of the wine. These glasses (although a cool novelty item) wouldn't really lend themselves to making the enjoyment of a great wine any better.
On a side note, they would be really cool for blowing bubbles in chocolate milk... just sayin
