Hopefully studies like this help the drivers recognize their value and they can negotiate better (leave until their rates increase).
This study says they're earning $3.37/hr in profit. Most of the rides in my city are $10 and take less than 20 minutes of time for the driver. So, if I paid $12.25 instead of $10 for rides, and the extra money went to the driver, they would earn $10.11/hr profit instead of $3.37/hr. That's 3x the profit for the driver, and only a 22.5% increase in the cost of rides. I would continue to use the service just as often.
I assure you I wasn't earning $3/h though, that was just what it ended up saying on my taxes because they let me deduct part of my fixed expenses that I was paying anyways like insurance, finance interest, license, registration, etc. It was closer to minimum wage, and tax-free at that (which suited me because my marginal tax rate was high from my day job).
Before Uber I just drove for free by myself in random directions for fun. That was way more expensive.
Edit: I also have an expensive car that guzzles premium fuel, or it would have been significantly more than minimum wage.
Unfortunately, I believe they make up a small minority of drivers, at least in most metro areas.