Literally impossible. The S6 finale and the Pharynx episode have confirmed that the changelings can reform themselves effortlessly at any time. Thanks to some monumentally poor writing, they have absolutely no justification to be 'bad.' Any appearance of new changelings will necessarily end with them being transformed.
Chrysalis has been effectively rewritten as a solo villain. Remember that she lost her crown at the end of the finale. Best case scenario, she'll pull some plot against the mane6, be foiled, and slink off never to be heard from again. Worst case, she'll fail and be transformed by fiat into a 'good' form, maybe even as that pink bug that was leaked a while ago.
It's kind of awful what's happened to Chrysalis, really. Imagine being dethroned, your entire race being wiped out of existence, your home destroyed. And it is kind of implied that she was the mother of the swarm, with Thorax's hatching scene and the lack of any other 'female' characters. Of course, the show will never acknowledge this, and even if it did it would make her transformation into a sparklebug almost mandatory to make the transformed hive 'whole' again.