i don't think its the theme's that are causing less interest in it, people just got bored with the competitions, and/or don't have (or want to take) the time to make the manips for these any more
but, instead of complaining about this theme, why don't you just enter and try to win, so, you can pick the next theme
or, suggest your ideas to the winner for the next competition
(sorry, if you all don't like this theme, it was semi based on my suggestion, which no had to use if they didn't want it, i was just putting it out there as an idea, but, i'll take the blame for this one)