YOU ARE CONFUSING YOURSELF BY THINKING IN DOLLAR TERMS. BOTH FEES AND UTXOS ARE DENOMINATED IN SATS. BLOCK SPACE IS FINITE AND SCARCE. AS ADOPTION INCREASES SO WILL FEES.
in sats, i think the fee rates change very little, and with LN and now ecash taking more and more of the payment load off, likely the fee rates in sats are gonna stay fairly flat they are going up in dollar value but so are the average transaction sizes due to the bottom end being shifted off chain