I keep landline for 2 reasons, 911 and to call my Dad. He is hard of hearing, and can understand me better on the wired phone than on my cell phone.
I keep an old analog phone line active here, for similar reasons. Cell audio quality (meaning, at 3+bars), between cost reduced phones and network compression, is often poor.
While I'm capable of setting up other telemetry, I like the convenience of an AC powered answering machine..... checking house-power while traveling just takes a phone call.
Long-term, I think many areas will retain landlines if fibre is present locally. As covered.... many telcos are gunning to drop their copper maintenance.
Rgds, D.