User blog comment:The Demon Archer/Why will Caitlin Snow is gonna be evil?/@comment-160289-20150423101244

If it does end up happening, I expect the character development to feel right, not just a sudden change to this evil person. But yes, it would be a shame, the team is so perfect together!

Not everything might be set on stone, the shows are constantly changing, perhaps she has instances of being evil but ends up helping in the end. Much like Merlyn "kind of" helps Team Arrow now.