If no one spends bitcoin, that means the bitcoin is useless. That is similar to other scam coins. Bitcoin will die.
It will not happen anymore if you dont spend bitcoin i think the price is gradually decreases instead of increasing..
And the price of bitcoin is always depends in demand and supply..
It can happen but it's not very likely. No transactions means the network will come to a hold, which is devastating for bitcoin.
But there are too many people using bitcoin, so don't be afraid my child.