Blair did indeed say "I do" to Prince Louis on last night's Gossip Girl.

That alone was surprising ... but then she ran out with Dan. Dan!

Why did the show take that route? Executive producer Stephanie Savage explains:

"Part of it was coming from Blair's character and really trying to follow and be consistent with her thought process and her emotions up to this point. And her willingness to stick with her plan and to take this to the end of the line."

"And as we started to think about the story that actually generates, if you kind sort of let your mind percolate into things that might happen in the future, it generates a lot more story this way."

To that, Co-EP Josh Schwartz teases, jokingly: "Plus, we really just wanted to piss off those Chair fans so they don't destroy my Twitter feeds on a weekly basis."

Savage is quick to point out that Chuck and Blair had "some great great moments in tonight's episode and there are many more to come ... they are not by any means done!"

Schwartz knows plenty of diehards won't be happy, however.

"They're going to come at us with pitchforks! I probably will just not go online. I mean, it's funny, on Friday we aired the final episode of Chuck [which Schwartz also created] and it was so nice and everyone was so lovely and now this will be... the opposite. They are coming for us."

Of course, it's just that kind of fan intensity that helped Gossip Girl hit 100 episodes in the first place. But will everyone keep tuning in to see what happens next?

"You're going to see how [what Blair did] impacts everyone," executive producer Joshua Safran, who wrote last night's "G.G.", says of the very next episode.

"Chuck and Serena together dealing with Dan and Blair together."

As for Louis, Safran says Blair will face "all sorts of consequences" from her new husband. "This is not taken lightly."

Re: Dan and Blair, he teases, "That story's going to go in an interesting direction."

As for the other huge reveal, if Gossip Girl really is the show's awesome villainess Georgina, does that mean Michelle Trachtenberg is now going to narrate the series?

"No. You'll definitely always hear Kristen Bell's voice as Gossip Girl because the idea was never that the voice was attached to a specific person and that one day, Kristen Bell would be on the show and you'd recognize that voice as Gossip Girl. So whenever we hear Gossip Girl, we hear Kristen."

Guess we'll have to wait and see if Georgina is really G.G., or an impostor.

Regarding the future of the season, and beyond, Schwartz explains that he wanted last night to "feel big ... something that would feel like it was pushing the buttons in terms of the core series mythology and core characters, but would also feel shocking and something that would really work as a springboard for the whole back-half of the season."

It also looks like another season is likely after this one, but no more.

"Our philosophy has always been that these kinds of show aren't meant to run forever... This season I think has been one of the best seasons of the show and there's a lot of creative vibrancy to the show and you want to go out on top creatively. So next year the actors' contracts are up and perhaps that is a natural time to end it."

Finally ... as for Blair's endgame?

Savage says: "I'll just say that to the credit of Blair the character and to Leighton the actress, she has so many layers and possibilities that you can really see how either of these guys would be a great fit for her."

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.