(Warning: The following contains potential - albeit entirely theoretical - SPOILERS for future Spider-Man movies in the MCU, as well as some discussion of recent story-arcs in a couple of Marvel comic-books. Proceed with whatever level of caution your Spidey-Sense suggests is wise...)
Now, for a character who was killed off by Marvel Comics way back in 1973 (in The Amazing Spider-Man #121, to be precise, fact fans), Gwen Stacy sure has managed to remain popular. Now, sure, being played by the ever-charismatic Emma Stone in the Amazing Spider-Man franchise helped - as have the continual murmurings about a potential appearance in the upcoming Spider-Man: Homecoming - but if there's one main reason for Stacy's recent upsurge in popularity, it's surely this: Spider-Gwen.
Y'see, whether or not Marvel and Sony opt to add Gwen Stacy, Perennial Love Interest to the Marvel Cinematic Universe, Marvel Comics has recently transformed her into something far more intriguing - a kick-ass superhero in her own right.
Arriving as part of one of the Spider-comics' more popular recent events - the reality-hopping Spider-Verse - the alternate-universe version of Gwen Stacy (who was bitten by that famed radioactive spider instead of Peter Parker, and thus became Spider-Woman) became an instant fan-favorite, and has since been given her own solo comic-book series. The big question that raises, though?
Could Marvel Actually Introduce Spider-Gwen To The MCU?
Well, as it turns out, it might not be quite as 'out there' an idea as it initially seems. Sony is reportedly keen to see the comic-book Spider-Verse hit the big screen - seeing as it would potentially enable a whole lot of less MCU-affiliated, yet equally profitable, spin-offs. Were Spidey's next solo adventure (it seems unlikely that we'll see Spider-Man: Homecoming deal with as unusual an idea as alternate realities) to head in such a direction, then it seems fairly reasonable to assume that Spider-Gwen wouldn't take to long to arrive.
How Would Spider-Gwen Fit Into The MCU, Though?
Well, to a certain extent, she wouldn't have to. Were Sony and Marvel to opt to introduce the Spider-Verse as a relatively standalone element of the Spider-movies (much as Captain America doesn't hang around in Asgard, and Thor isn't likely to turn up in a 1940's flashback) then there's every possibility that the introduction of Spider-Gwen could take place on its own terms. After all, if Spidey were to be hopping realities left, right and center, then there's no real reason why the MCU's internal logic - other, Fox and Sony-produced, Marvel movies don't exist, for instance - would have to be obeyed.
In which case we could absolutely see, say, Emma Stone return to the role of Gwen Stacy - albeit as an alternate reality version of the character - and indeed subsequently star in her own solo movie, were she to be as well received as she was in the Amazing Spider-movies...
On the flip side of that, though:
There's Also The Possibility That Spider-Gwen Could Usher In a New Era Of Alternate Marvel Heroes
After all, her comic-book is absolutely stuffed with magnificently geek-friendly alternate takes on classic characters. The Punisher is a senior member of the NYPD, for instance, and Matt 'Daredevil' Murdock is the Kingpin's right hand man. Best of all, though, Peggy Carter is the world's Nick Fury analog, and spends much of her time dealing with the newly-arrived-in-the-present Captain America: Samantha Wilson.
Who is a) awesome, and b) could provide Marvel with an innovative way of solving Chris Evans' eventual departure from the role.
After all, if Marvel Comics' new Iron Man can be a 15-year old woman, why couldn't The Falcon's grandmother take over as the MCU's Captain America? Or Peggy Carter become the new Nick Fury? Or, heck, a second, law-abiding Punisher turn up and take on his vigilante counterpart. The world is now officially awesome enough that such ideas are - if not quite likely - at least possible, it seems.
In other words? Let's get Spider-Gwen into the MCU - and see who follows her...