It is more commercially viable because it is much much cheaper, and as a previous poster mentioned, it detects pressure continuously. Capacitive screens are expensive to manufacture. Look at the iPhone, it is several hundred dollars for a very small screen. Also, the technology mentioned above does actually do a lot of the low level processing in the on board electronics. It's power draw is minimal.

Um...well, for one, you are linking a single pressure input, vs something that can detect multiple points of pressure (continuously) with the number of connections to electronics being of order 2n on an nxn grid. Most grid bases multi-touch sensors have n^2 connections and much more complicated and expensive electronics. It does help to read the articles before you post.