I suspect this will have little affect on the TTXGP races. The AMA charges the track to hold the event, and I heard attendance has been down and hasn't been making money. If the TTXGP does it right it could still at Sonoma, and they may still put on the Moto Jam event, as the AMA races were only part of that event. The bigger issue is how few bikes show up. Laguna is a huge race and makes plenty of money. I don't think there is strong a link between the AMA and TTXGP as some would suggest.
Brammo is good about showing up, so if they bring both GP bikes, and Shelina on the Empulse TTX, that's three. Zero is sure to show with 4 Zeros like this year, that's 7. Amarok should show, 8. VT is 9. Lightning making it again would be 11 with both bikes. And, lets not hold our breaths, but I heard MotoCzysz are simply getting their ducks in a row for next season so should they decide to race they aren't scrambling last minute. But, I don't think they'll attend any races before the TT. You never know, though. Plus whoever else decides to race their Zero or Empulse in eSuperStock. It could be a good grid (an actual 10 bikes on the grid would go a LONG way in securing the Sonoma/TTXGP relationship), but they always seems to fall apart last minute. I'd like to see Sonoma continue their support of alternative energy, but we'll see.
My 2 cents,
Rich