Right now lots of people are interested in this, it looks like it's going to be a very competitive space. Most people are building their own web wallet to go with it
Many of them marketing themselves as ultra-secure storage where the wallet provider can't steal your coins. This is a myth though, since the service controls both your wallet code and co-signature, they could easily obtain a 2nd key and take your money.
I think cryptocorp has the right idea. They are advocating for separation of wallet and oracle. They might lose out though - the market will probably go towards all-in-one solutions under the false belief that they can never steal your coins, until the next goxing happens.