First, I assume by landline you don't really mean POTS but include VOIP. ...
That's the problem with all these discussions (they come up from time to time), I never know (and I'm not even sure the poster knows) if they are talking about the old school copper-line analog phone service only (POTS - Plain Old Telephone System), or if they include VOIP (through DSL, DSL Dry Loop, or other internet connection).
We maintain a VOIP phone, have not had POTS for many years (was expensive and limited). Our phone adapter provides two 'virtual lines' on the same number. I have a wireless base connected to each line, with extensions all over the house, in the basement and garage. No fumbling to find the cell phone (it's upstairs, plugged into the charger!). And we can pick up an extension and get in one the call w/o needing to be in the same room and put it on speakerphone. And we'd need to pay more to get more talk time on our phones (Ting is cheap for our two cell phones as we use few, sometimes zero minutes). There is always one near our bed (needed when we had relatives who were very ill, and we might get a call at any time). Lots of advantages for us.
Many will find a cell phone only is satisfactory for them. I'm just pointing out that using a "landline" doesn't make someone a dinosaur, they have advantages that may or may not be important to the individual.
Oh, and the poll is wrong on many levels. I think the poll is wrong, bla, bla, bla,
and I also like soup. But it was set up in "radio button" mode, and I can select only one choice.
Also, if you
"Just have it for internet service", then
it isn't a telephone line, it's an internet-only line (DSL Dry Loop). So it's an oxymoron to say "I have a telephone line only for internet service". No you don't. [edit, just saw the previous post - OK, I suppose you could use a POTS line for dial-up internet, but not use it for phone service?]
Aren't you glad you made a poll?
-ERD50