1. The Historically Inaccurate Route
While it wouldn't be the first time the writers changed parts of Mary's life, the current plan on Reign appears to be Francis' little brother Charles marrying Mary, Henry VIII-style, but I have a feeling this wouldn't turn out well — and not just because it never happened in history.
2. The Historically Accurate Route
Mary is still the Queen of Scotland and it makes the most sense for her to return home, like the real Mary did. Already widowed at 18 years old, she could definitely benefit from some time in the Scottish countryside, even if she has to rely on her half-brother James to hold on to her throne, as Biography explains was the case in real life.
3. Mary Meeting Her Second Husband
Mary's character has no shortage of love interests on Reign. The story could follow Mary as she met and fell in love with her second husband, Henry Stewart. It would require a generous six-year time jump, but isn't a huge part of this show the intrigue of romance?
4. Elizabeth Confronting The Threat Of Mary
Season 3 started off with an introduction to England and Queen Elizabeth, and I think Reign plans to follow up on this meeting. Watching their relationship play out in the earlier years would be interesting— especially because as Biography explains, Elizabeth eventually imprisoned and had Mary beheaded after she was exiled from Scotland.
5. Catherine de' Medici & Mary Find Mutual Respect
This relationship has definitely seen its ups and downs. However I have a feeling that they will need each other following Francis' death. I envision a power duo of them working together. Not to mention that in real life, Catherine served as the Queen Regent, so joining together would allow Mary to stay in France just a little longer.
Even though we're losing Francis for good, there's still an opportunity to see Reign blossom and go in new directions. So while I'll definitely cry during Francis' final scene, I look forward to seeing what it means for the rest of Season 3 and beyond.