Here's my blog post on the pivot.
http://betashop.com/post/3741657155/when-to-change-your-game...
I've always said that if you can't gain some considerable traction in 1 years time, it's time to move on and try something else as there are lots of good problems out there to try to solve. We stuck to that 1 year rule with the old fabulis.
We threw away all the old code.