I'd have two concerns trying to extend the life of shoes that were that worn:
1. Unless you wear the soles out precisely evenly over the whole surface you are tilting the shoes and therefore your feet. That's not great for your biomechanics and the wear/tilt will accelerate since you are shifting your weight on each foot in the direction of the tilt.
2. Modern shoes have constructions that absorb shocks that wear out over time so the shoe isn't performing as designed, which can lead to more biomechanical problems.
I see a fair number of people walking around on worn out shoes with their feet tilted. Presumably they are not having serious problems at that point, but they are doing repetitive strain type damage that will eventually lead to an acute problem unless they replace the shoes.