I've been landline free for going on 7 years now. No more interrupted dinners due to unsolicited telemarketers, not to mention the monthly service fee I'm no longer forking over.
The only area where cellphone use concerns me is while driving. I'm sure there is enough technology available to disable cellphone communications while a vehicle is moving, and I'd love to see that technology become standard.
Of course... there are other nuisances I've learned to live with. I don't get bent out of shape like I used to when the lady in the checkout line is talking to someone on her cellphone, or the rare instance when a cellphone might ring in a movie theater. I think that (at least in my everyday travels and experiences) the cellphone etiquette has improved a lot over the past few years.
I'm also able to text old friends over in England and maintain contact with them on occasion without having to email or spend money to call. It's nice that I can FaceTime with my daughter in the evenings some weeks when I'm missing her... or that I can put in an address on my iPhone GPS and get to where I need to go without printing directions off the internet or having to purchase an aftermarket GPS system. And the bluetooth/handsfree feature enables me to plug in the music I want to listen to, instead of listening to the garbage coming out of the radio speakers via FM and listening to endless stupid commercials.
And I can do those things while being responsible, be it standing in a line at a grocery or behind the wheel of a moving vehicle.
Discourteous and disrespectful people will always be discourteous and disrespectful, with or without a mobile phone glued to their ears. Or, for that matter, social media and a keyboard. Same concept.
Some people just don't deserve the air they breath, regardless of whatever technology they're abusing.