As someone who has grown weary of how stagnant the storytelling on this show has become, I am ALL in on a reboot, and if a handful of castmembers is the price that needs to be paid, so be it. It'll shift things up, relationships that will be lost will pave the way for new ones. Same as with TVD. Nina Dobrev left, and the Damon/Bonnie relationship was strengthened as a result. And tbh, I enjoyed that more than the constant up and down of that relationship rollercoaster. And now there's room for something similar here. What's the relationship between Regina and [blackout]an adult Henry[/blackout]? Do they even have one? Could there be a Hook/Regina friendship without Regina constantly being there for the Charmings and Hook being up Emma's ass? How will brand new characters factor in to all this? Hell, [blackout]who is Henry's Baby Mama[/blackout]?!
All the actors have done fine work, but some of it is played out. We don't need yet another "Look and see how Snow and Charming first met [new addition to the show]". We don't need more "Gold's been good, but uh oh, he's falling off the rails again. Can Belle pull him back?" It's been done and done again. To have some of those characters remain, but in a new context (not to mention a new time period), to me that's the best thing for the show. It almost returns the show to where it started in the first two seasons with: Here's fairy tale characters you thought you knew, but it turns out there's a lot you didn't know/here are those same fairy tale characters who've had their happy endings taken away and have been dumped in our world/Now those characters have been awakened, but they're still stuck in this unfamiliar world. To see where certain characters are 10-15-20 years ahead puts things back into that mode of storytelling that doesn't just rely on "This happened, let's go to Neverland/Now THIS happened, let's go back to the Enchanted Forest/Now this OTHER thing has happened, LETS ALL GO TO THE UNDERWORLD!" and stretching certain backstories beyond the point of credibility.
If the show were to continue on, this was absolutely needed IMO. I guess time will tell how big or small a hole will be left by certain exits, but I'm honestly more excited by this than if the narrative were just continuing as is.