I have Vestalink "unlimited". I got removed from my unlimited plan briefly when my phone call minutes caused their computer to be unhappy with me.
I did tech support for FIOS. I talked to thousands of people. Cell phone quality sucks, especially if you have some hearing loss. I will always have a landline. I do have a cell phone, and use it when needed, but there is also the
possible issue of cell phone radiation, issue of poor cell reception, issue of state of battery charge, etc., etc.
My wife and I have parents in their 90's, who live far away. We (had) a sibling with cancer. We have children. Sometimes she/I need to talk a lot on the phone, whether it's to help manage our parents care, take care of our own personal affairs, or just to talk on the phone.
I am reminded of when transistor radios first came out. The quality was poor, but the radios were cool. They got better over time. People listen to MP3's on their phone or MP3 player. I am sure, lots of those people don't realize how much quality they are hearing (or not hearing) with a low bit rate rip, or poor quality headphones. IMHO cell phone quality is in it's infancy.
-end of rant-