The metal coating that makes iPhones touch sensitive is running out

...but will likely be replaced by one of many technologies currently in development before it runs out at the end of the decade

"ITO comes from the metal indium, which must be mined"

The bulk of our indium supply actually comes as a byproduct of zinc mining.

As for alternatives to ITO there are many startups working on next generation technologies. Off the top of my head I can name Cambrios (mentioned in the article), Innova Dynamics, C3Nano, and Sinovia Technologies.