Mining for rewards is not the only way mining can occur. It can also occur from fees. And since the total number of bitcoins is capped, it will soon only happen

Mining for rewards is not the only way mining can occur. It can also occur from fees. And since the total number of bitcoins is capped, it will soon only happen via fees. The amount of fees is unlimited, and the total possible energy usage is currently unlimited and will remain unlimited, and scales with use.