Evidently, I wasn't clear. So let me put it this way: what if you threw a convention, seamlessly distributed 10,000 good-to-go tickets, and nobody came because no-one knew where it was?
Time will tell.
What is interesting is that in the case where very few people knew about the spin-off, then there would be very few buyers
and very few sellers. If the price grew due to demand, more people would discover that they hold the keys to additional supply, and liquidity would grow. If no one at all wants to buy the coin at any price, then the spin-off would die.
I think the promotion of the spin-off's "launch" matters to a certain extent (obviously the spin-off needs miners in order to function), but I'm not sure how much it matters yet.