Most of my friends have abandonded their landline telephones in their homes, and solely rely on their cell phones. I considered doing the same. Having just one phone number and one phone bill definitely simplifies life a wee bit.
However, a far more compelling reason exists to hold on to the landline. When I'm home and cant find my cell phone, I just pick up my home phone and dial my cell phone number. Usually, I can locate it before it stops ringing!