I think that in the next 1-5 years the use of landline phones will dwindle to almost nothing. Even today you can see that they are no longer as favored as they once were. For an example, since moving from childhood home five years ago I have only owned a landline phone for a single year before getting rid of it.
I also believe that the landline phone is on the way out because there are more ways to communicate today. IP telephony services such as Skype is such a way. Besides that there are mobile phones (unreliable in some places due to poor coverage).
In 6-50 years I think that humanity’s presence in space will increase. One of the reasons for this is that there are more and more commercial space projects being started. For an example of this one can see the growing space tourism.
