There are many shale wells that by themselves generate more cash than they cost to drill, complete, and operate. When you add the cost of capital + cost structure of operators, the game changes a lot, not to mention the cost incurred to learn how to drill a good well and effectively stimulate it.
I think if you were to compare our current situation to one where shale drilling was never discovered, obviously the supply side of the equation would be vastly different. I'm not convinced we would be in a better place as an overall economy without shale drilling. Seems like we would be more reliant on ME oil. I think commodity prices for Oil and NatGas would be higher than they have been since the mid-2000's, resulting in electrification being more competitive on cost. If shale drilling hadn't been discovered when it was, it could have hastened the death of the industry IMO. Keeping oil cheap is a significant factor in what is keeping the industry alive.