On/off-ramp fees for stablecoins vs traditional rails

I'm still trying to wrap my head around the economics for smaller merchants. While stablecoin transactions themselves can be cheap, the fiat on/off-ramps often seem to carry a decent percentage fee, especially for anything under five figures. Are these current fees for converting $USDC to fiat via common services actually competitive enough with traditional credit card processing for businesses dealing with lower average transaction values, or is the main benefit still largely for larger B2B payments and international transfers?