Again, at a given resolution and size, the 4:3 will still have more pixels available, so you will see the exact same thing as on a 16:9 monitor. What's happened is that the tv industry is so large that 16:9 screens are much cheaper than alternative sizes. On a tv, which is dedicated to use that is almost entirely 16:9 that makes sense. On a computer, where most content is not 16:9 it is being done because it is cheaper for the manufacturers, not because it is better for consumers.
Things looks the same on my iPad 2 as they do on my iPad 3 despite the resolution. Things are crisper on the iPad 3 however.
What use is more content if its in unused places of a game or in black bars of a movie?