I would except for two reasons. The first is my house alarm works off the landline unless I get the updated system. The second is in case there's an emergency and I lose my cell phone signal. Dropped signals don;t happen a lot with my service, but I prefer having the other option just in case.
I got rid of my landline two years ago to save approximately $30 a month in fees (USD). Before you rid your landline be sure to circulate a replacement number to all family, friends and monthly bills. Also be sure that you will not need the faxing capability. For me it has been well worth every bit of effort not to get hang up calls on the answering machine or unwanted sales calls.