Personally (and this is coming from somebody who loves to sing), I find that singers have been put on a pedestal far above any other type of talent.
Maybe it's because you're focussing on one person, that the person is centre stage and that their form of music is the most easiest for the unmusically trained to grasp (I'm not trying to be condescending there) and other musical talents are less noticed by the 'general public'.
Mind you, I think the popular status of the singer in the past 40 or so years has been due to the fact that it is also the musical talent that lots of people tend to go for first. To be a singer you don't necessarily have to be able to read music.
Unfortunately that's just a fact of the state of our music industry today. You listen to a lot of modern tracks and the focus is put on the singer and often you have a very basic repeated backtrack. Sometimes you are lucky enough to get a backtrack that was recorded by real musicians in a real studio. Sometimes the singer is even so mediocre that they have to be autotuned and have to mime their 'live performances'. The person's stage presence, appeal and physical appearance is much more important than their actual singing ability.
Anyway, that's just how I see it. My faves to win were the Circus of Horrors, but I don't think they are even in the final. I'd like to see a non-singer win, I quite liked that pianist, and also the very flexible dancer.