Except depreciation and other costs are pretty heavily a function of miles rather than time. (Especially outside of the snow belt where the number of winters plays a big role in salt damage.)
>They also don't have to front the capital cost of a medallion.
That's true but how many places is that a big factor?
We can argue the details and you're right that it's hard to compare dynamic pricing to long-term negotiated fixed pricing.
But I'm not really making a case for exactly where pricing/costs will end up assuming sustainable ride-share businesses. I'm just saying that taxi fares in most markets are probably a reasonable benchmark whether or not ride-share on average settles a bit higher or a bit lower.