Of course it wouldn't be a good experience, the product isn't designed to work under those conditions. By the same token, you could take a Mercedes S class offroading, but it wouldn't do well, because it's not DESIGNED for that. Their formula works for the destinations they fly to. WN is a great airline, but there's no way in h-ll I'd fly 'em for more than a two hour flight.

By your logic, I could argue that the CX product wouldn't be a good experience. Try flying HOU-DAL on CX. It takes forever to board and for everyone to find their assigned seats. Most people never get served because the FAs are scrambling trying to get service done and don't have enough time.

Now on the original topic, I think Southwest already has it down. Can't beat free flights. Fly a few times, get a free ticket you can use whenever for whatever reason. Fly more, get more tickets. Fly a LOT and take your companion with you wherever for free as long as there's a seat open.