That's what I did in my last place because they hadn't put any cabling upstairs except for power (no telephone, ethernet, audio - nothing) I found it very easy to make a small hole in the wall and run a jigsaw all the way up. Great fun at the time but I had some nagging doubts when I stepped back and saw the centimetre wide strip I had removed floor to ceiling. After popping in some sensible ducting from ground floor to attic with drops at useful places It was dead easy to plaster in and paper over with no obvious sign. Wireless is okay, but it isn't gigabit ethernet!!