edit: I just reread and realised you said "reconsider" and not "consider". Implying you already knew this, sorry.
Here is the blog post in case anyone missed it anyway: http://identity.mozilla.com/post/78873831485/transitioning-p...
and on HN:
Correction: There aren't any more employees being paid to develop Persona. Mozilla is still paying for the infrastructure, and the community (which includes paid employees like myself who want to work on Persona on the side) is still working on it. I actually got a pull request merged just yesterday (my first!). There's also ops/IT staff who will be helping to deploy and respond to service disruptions.
<hope>We could very well find that after Firefox Accounts is up and running that focusing employees back on Persona is the right thing to do.</hope>
Running well? You'll know there are still tough problems next year. No one download 100 MB or 200 MB scripts and assets to play a game. In the past, all such resource rich Flash or Unity Web Player games have failed. No exception.
The relief is Mozilla people actually know this problem (I talked with them at GDC).
AAA games are just too rich to "browse" on the web. People close their browser windows within several seconds. Typical home internet bandwidth is narrower than Blu-ray or DVD-ROM, even in advanced countries. Furthermore, browser cache can't handle big resources. You won't even gain server costs.
Browser gaming may or may not take off, but I really don't see asset-size being the rope with which it hangs itself.