Re: So that's one fondleslab
They are replacing the PC as much as digital books are replacing hard copies. PC's have advantages that portable touchscreens don't such as better hardware for games, media manipulating, animation rendering, or any other CPU heavy programs, not to mention more sizable disk space storage. Also many people just like to sit down at a desk and have a big screen, keyboard, and mouse without needing to unplug/dock anything. Just like some people prefer a hard copy of a book.
While they may take a market share away from PC's, they will never completely replace them because of these advantages the demand for PC's will still be sizable for a very long time to come.