Typing Chinese characters usually means typing out the pronunciation and then selecting the character.
I think the point that symbolic characters are on the decline is very valid.
It's true that symbolic (logographic) writing systems have various disadvantages. However there are also advantages. For example, whilst reading Chinese is harder to learn, once learned it's easier to read quickly because there are fewer characters needed to make up a word. You can squeeze up a lot of meaning into a very space. A good example has appeared fairly recently on the Chinese intertubes. They have a Youtube-like service which shows pirated TV shows over which are laid viewers' comments, which scroll horizontally across the screen. Many different comments are floating across the screen at the same time. The idea is to poke fun at the plot line, etc, etc. Now the interesting thing is that you're only allowed very few characters to make your comment, I don't recall how many but I think it's about 3 or 5 or so. That's easily enough for them to make a witty point. This just wouldn't work in, say, English. The comments would take up too much space and you'd likely only ever be able to read one at a time.
I used to think that too, because from an information theory standpoint it should be. Like CISC vs. RISC, the complex characters should mean fewer characters. And in some instances, like maybe microblogging that's true. But look at any product packaging, instruction manual or form written in several languages. English almost always takes up the least amount of room.
There are probably lots of reasons for that that I can think of: The characters need a larger font size due to their complexity. Maybe there are a lot of concepts that don't match a single character, so then you have to have combinations and that takes space. Also language tends to evolve short words for commonly-used concepts, so a phonetic language will likely use short words a lot. Written Chinese doesn't benefit from this as much, because you need to have an integer number of (large) characters.
Also, Chinese words are short in general, even when spelled phonetically. So the savings might not be that high to begin with.