I absolutely think it would be worth it. The data format change would be one thing. There are many other factors which are worth considering. For example, the l

I absolutely think it would be worth it. The data format change would be one thing. There are many other factors which are worth considering. For example, the long lived connections of XMPP don't work well in the mobile environment. There are XEPs which address things like this. I think to do it right, you have to build a company around it, and build it in the open. Also, no one is going to jump on a protocol just because it's open. It has to be built around a service which is compelling in its own right, and gains user traction regardless of the protocol. Geeks can get it going, but it has to be self sustaining.