How can gold and bitcoin not keep going up in price?

Seeing that have such tight supply constraints that appear to get tighter and tighter as the years go on, I struggle to see how these would see any kind of decline over a 5+ year period.

Gold: it’s getting more and more costly to extract from the earth. Then again, if the price goes up, that makes it more economical feasible to mine more and increase supply.

Bitcoin: obviously supply is capped at 21 million. Estimates are that 4 million are lost forever (that number will continue to increase every year, meaning supply will go down). Only about 1 million are left to mine over the next 115 years. Institutional investment contributes to increase in Bitcoin.

Help me understand the Bear case for either asset at this point with demand set to increase and new supply only decreasing.