Bitcoin isn't like a power supply system, so your logic is false.

People can only "use" electricity but they can't "send" the electricity back to the system or "pass" to other person. In Bitcoin, you can send it back or pass to other person, if the demands keep rising, it would make people who hold Bitcoin to sell it. Not something like people have to keep it all cost.

There's always a Bitcoin you can buy, if you can't, that means you don't have enough money.