For the record, as a person whose loyalty is WN first, then DL, I've switched travel patterns - I'll now fly to the nearest WN city to my destination, rent a car, and drive the rest of the way.
I'm a scuba diver. I'm going to carry gear - renting potentially unserviced, possibly hazardous life support equipment at a destination is rarely an option.
You've now added $120 roundtrip to my fare? This is a no-brainer.