Why not have a Hispanic Disney Heroine?

Given the fact that Disney execs finally noticed about 10 years ago how whitebread their heroines had been, and started giving us a little variety (Jasmine, Pocahontas, Mulan, Lilo, Tiana), I'm sure that there are story proposals already being considered for a Latina heroine. Probably not in the next few years, though, because their movie line-up is already set.