A parody is likely for the "Disney pop" genre. Al would be foolish to not do one. But I highly doubt we'd get a style parody of one of those
If you notice, Al only does style parodies of artists that he himself likes and respects - TMBG, Dylan, Aerosmith, Zappa, Doors, B-52s, REM, etc. Parodies target whatever happens to be popular, but style parodies target the music that Al himself likes.
Not saying that Al doesn't respect the Disney artists, but I'm fairly sure that he doesn't listen to them in his spare time. That's probably why, despite my constant whining about Al not doing an original rap song, he still hasn't done one. While rap is ever-increasingly popular, and while several of his most popular parodies have been rap songs, I don't think Al listens to much rap on his own, and so we're unlikely to ever get a rap style parody.