From what we see in the video, I don't believe L.A gets fully destroyed on parts of it. I'm hoping to see the Tengu open their main door and come to the assistance of the 5 races living in L.A and from there a new era of friendship and exchange will develop between those 6 races and the gates to the Dominion of Winds will be permanently open with a sentry presence of course.
Now is a good time because you'll get to see the end of a character we love to hate, also the attack on L.A. 2 to 4 weeks from now after Scarlet's demise Anet will take a break so they said but did not mention how long. Then they will release the equivalent of a small expansion again without mentioning how big. After Scarlet is dead or simply defeated I hope we'll get to see a blog about what's coming for the remainder of year. One thing is clear for me however if by the game's second year there is still no expansion no matter how big there won't be a me.
Only if before we kill Krakalkatorik he swallows Palawa Joko in one gulp so we don't have to deal with him a second time when Elona becomes accessible once more. Now that would be worth a collectors edition.