They could still make a song based off of your theme. i've done a few of the challenges here that were from two years ago. if they don't, then maybe they will join in the next challenge.
that's a tough question, as much as i would like to make a song based off of someone else's theme, i also would like to have my theme used in a better way then i could provide.
so really, i don't care if i'm chosen or not. i win either way. :P