Do we really need a landline?

I realize that we really don't need a home phone anymore. When I'm at home, I find myself reaching for my BlackBerry to make a call. All my contacts are there, both personal and professional, everything is synchronized to my desktop, to my calendar... to my life. I read last night that according to research conducted by CDC, in 2007, 13.6% of U.S. households were already cellphone-only. A number I would only expect to grow considerably in the following years. 

There's an additional advantage... we'll get rid of those annoying telemarketing calls.