Unlikely. But if that happens, Google isn't the only company in the world with the knowledge and ability to maintain V8. Joyent does as well. But let's assume

Unlikely. But if that happens, Google isn't the only company in the world with the knowledge and ability to maintain V8. Joyent does as well. But let's assume something even more unlikely: Google, Joyent and the rest of the world drop V8. nodejs is an open-source project. You might as well worry about being hit by lightning.