There is no magical date when all POTS lines will vanish and traditional landlines will become obsolete. In one case, AT&T announced a plan in December 2024 to shut down its POTS line service by 2029.
The bottom line is that POTS lines, which form the Public Switched Telephone Network (PSTN), are headed toward an inevitable sunset and becoming more expensive as carriers struggle to continue providing service to an ever-shrinking subscriber base. All of this is driving both residential and business customers to switch to alternative phone options.