As always: ***SPOILER ALERT***
This will be brief…
Not-so-bold prediction: We have not seen the last of Janine…
Janine tells Sherlock while he is in the hospital that she bought a cottage in Sussex Downs and that there are bees there. In the Sherlock Holmes by Sir Arthur Conan Doyle canon, Sherlock Holmes retires to Sussex Downs and becomes a beekeeper.
Janine says she will be getting rid of the bees, but if Gatiss/Moffat stay true to canon, that won’t happen. My guess is Sherlock and Janine will cross paths again (probably soon) in order to keep that part of the canon intact.
Time will tell, of course, but I am excited to see what they will do with her. They (Janine and Sherlock) had good chemistry; I could see an entire episode devoted to Sherlock coming to her aide in Sussex Downs after she gets herself into trouble. I would go nuts if the “trouble” greatly involved “The Woman.” However, I trust Gatiss/Moffat to use her properly.