VoIP VS. Cable & telephone networks

After reading the article by Robert Valdes, it is evident that VoIP is a much more efficient, cost effective way of making phone conversations. It seems as though VoIP is going to eventually take over the telephone networks for making phone conversations within the home, especially long distance calls because of the obvious reasons. However, when I think about telephone networks, a lot of what I think about is cellular phone technology. I don't think that VoIP is going to replace all other kinds of currently established telephony technologies because of a few reasons. First of all, in order to make calls over VoIP one needs a computer and an internet connection. Many people don't have these recourses and/or don't prefer to use them. (Such as the elderly generation) Secondly, cell phones would be really hard to beat. It seems as though cell phone technology is skyrocketing, and everyday they are coming out with something new. Until they can get a computer with VoIP as small and portable as a cell phone, many people will not convert. Although Valdes discusses cell phones very briefly when discussing codecs, stating that cell phones are a type of technologies which employ digital to analog conversion, he never really discusses the impact of VoIP on cellular technologies.
Maybe this is his way of saying that sooner or later, VoIP is going to converge with many existing technologies. Instead of completely replacing today's already well established technologies, VoIP has an opportunity to be a great compliment to them. Overall I think that VoIP is an amazing technology, but it's going to take a long time for a lot of people to be able to switch over. Many people I know aren't even familiar with what VoIP is, let alone the benefits they have in using it.

Discussion Questions:
1) If fully adapted, how long do you think it will take VoIP to take over current telephone techonolgies, and what impact will this make?
2) Where do you see VoIP going in the future as far as portability, accessibility, etc.?
3) Does VoIP mean the end of all other communication technologies? Why or why not?