One thing I didn't think of is that even if some of the ecommerce hosting players start supporting BTC - adoption rates would be huge as support would be builtin - bitconmoney gets right to the point with their twitter posting (Babbletees is hosted on Shopify):

bitcoinmoney : @Shopify Are you adding support for payment via Bitcoin soon? Your customers aren't waiting around for that to happen: http://j.mp/kjbhnL

Kudos to that!