As the article points out, it is only really true of IE -- the 'enterprise-friendly' browser -- that feature updates are accompanied by major version change. It's somewhat disingenuous to generalise that to 'a browser' when most browser makers have found that release model to be inadequate and their growing market share bears them out.
> w/o any degredation in the core business.
There's a conflation here, by enterprise, between browser-as-client for in-house apps and browser-as-web-browser. If your test for degradation is that the in-house apps continue to work then sure, that's verifiable. But if you acknowledge that the same program is used for both purposes then you would find it much harder to show that no degradation of user experience and productivity have occurred.
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I personally think the success or failure of the rolling release model with separate streams for early adopters depends entirely on the QA standards of the vendor. Google has shown that with stringent QA, this model can help greatly in catching bugs before the mainstream user is exposed to them. This is what inspires the confidence that allows people to accept silent push updates. If Mozilla can be as effective in quarantining bugs before general release then they will earn the same level of trust. But if they're not able to keep major bugs out of the limelight using this process, it's going to be extremely counterproductive. I worry that they're just not militant enough about QA to make this work.