Today, most people use cell phones instead of landlines. They are more convenience and they have more features. Landlines are not useful anymore, and many people don't have a land-line telephone at all. We should not worry about updating land-line infrastructure, and instead invest in better cellular and Internet networks.
It's a more urgent question in rural areas where cell coverage remains fairly spotty, ... Perhaps we should keep landlines until we are sure.... I don't really care much about my landline phone as we rarely use it, but Icare much less about cable (etc.) ... My elderly parents would like to get rid of their landline.