As many of you likely realize, this review title is the same as the latter part of the later title of His Last Bow, which was, chronologically, the last of Conan Doyle's Sherlock Holmes stories. Considering the Case-Book of Sherlock Holmes, though it occurred earlier, continued Holmes' adventures and was published later, I thought the review title appropriate.
Their Last Bow is Elementary's finale but the ending, in fact the whole episode, indicates the adventures will continue, though we may not get to see it. Presumably, Holmes and Watson will get their old consultant positions back, reporting to Bell instead of Gregson. And Moriarty and McNally are both still around to create havoc and fodder for more cases, not that NYC isn't capable of doing so all by itself. With the preponderance of evidence in the world of TV today, the door is left wide open for a reboot or a TV movie or two at some point in the future. Or at least more novelizations.
For now, though, this is the end and it wraps things up nicely, just in case there is never anything further. Holmes not only lives but is still doing what he loves most taking criminals out of action...and apparently every important person not only knows it but is fine with it. Gregson lives to enjoy retirement, even though Paige is gone. Bell is Captain at the precinct now and is married and a father. Watson did finally adopt, a son, and has beaten cancer. And she also finally published her book on their adventures (remember she started it in season 2 episode 3). Even the bees are still on the roof of the building, well looked after by Watson in Holmes' absence. Reichenbach is gone for good...Holmes' return won't change that. And with no more family issues, and presumably neither Moriarty nor McNally willing to intervene either, there seems to no longer be anything standing in the way of Holmes and Watson working and living in New York at the old brownstone and being happy together forever.
And for Conan Doyle fans there are some clever moments, like the title of Watson's book (though spelled without the hyphen) and Holmes' aliases Altamont in Florence, which was Holmes' alias in His Last Bow, and Sigerson in Norway, which was one of Holmes' aliases in between Reichenbach Falls and The Adventure of the Empty House, which in turn not only depicted the return of Holmes but was also the origin of the card-playing Ronald Adair character. I'm reasonably certain Watson's son's name, Arthur, is a nod to Conan Doyle himself.
Of course, there are still some loose ends, notably the will they or won't they question for the shippers out there. But we don't really need confirmation of a romance...some of us would rather they remain platonic and what we've been given should satisfy all. There are no remaining questions for which we can't live without the answers.
However, it would have been nice to see Jamie Moriarty on screen one more time. Perhaps the only thing I really missed in the episode.
All in all, the Elementary team has given us a very satisfying end to the series. Though I, like many others, hope for more at a later date, I think we can all be happy with where they left it.