What I'm about to post may sound out of left field or completely off-kilter given the seemingly unfortunate news but please, consider this:
a) Supergirl has lasted six seasons. That's five or so more than many initially predicted. The show did things and went places most people couldn't fathom five years ago. Some avenues worked out well, others were misses, but the effort and intent was there.
b) Despite the initial downbeat news, this does lift a burden off of the cast's (especially Melissa's) shoulders because it does provide a definite trajectory and a planned conclusion. Lives can move forward in different directions.
c) Just because the show is wrapping up after Season 6 doesn't mean the character will disappear. It simply means that another version / iteration will have a chance to appear (possibly in the proposed film or later on as an All-Access type TV or web offering) for another audience or generation to enjoy.
d) The actors on the current show stand in very good stead in that their work on this project has and will allow them to continue to gain work and remain relevant / in-demand in the industry. As an added bonus, Melissa's TV and acting stature and credentials rose substantially from being on this project and it will help her career in ways she might not have imagined six years ago.
e) When one door closes, another one will surely open. (Also, when one chapter finishes, another one begins).
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