New character models = cash shop
This isn't actually a bad idea, because only the people who WANT to have the new models for their toons can pick and choose which one. Everyone wins.
For example, I like my hunchback orc so wouldn't pay to have him updated, but I would definitely pay $15-25 dollars to have my human warrior updated with a new model. There's really no reason why Blizz SHOULDN'T do this. They make tons of money and only the people who want their toon to look different will purchase. Thoughts?