That's why products like Slack, HipChat, Campfire, etc exist.
Unlike the people who can't figure out why this is better than IRC, I find a ton of value in your project. After leaving Campfire, moving to Kato, and then settling with Slack, I am really unhappy with the Slack mobile experience.
A really high quality web (maybe even HTML5 client-side only even?) XMPP client would be a welcome thing. This, not so much.