Until webkit introduce a better debugging tool than it currently has, i dont think any web developer is going to stop using firefox and firebug as their main development browser.
I hear this all the time, yet not one person can tell me precisely what Chrome is lacking when it comes to dev tools. What is it you're missing? Anyone?
I use Chrome and the built in dev tools. I think they're great. I also got this plugin that helps debug styles but that's about it. Firebug is the reason Firefox can be so slow at times. There's a decent sized exodus from FF and Firebug to Chrome and Chromium. I love Webkit, personally.