There are two ways to attack material scarcity: Switch materials or get better at needing less.
Both have their own issues, with swapping materials requiring different production processes, machines, designs, engineering, and the whole issue of ramping up scale to reduce said cost. All that, however, takes a long time to get up and running, as well as seeing those wanted price reductions. Then there's just doing more with less, which requires a good amount of reengineering, as well as understanding how a material and part is going to react if you reduce the mass of the object.
