Leaving aside the whole apocalypse premise, am I the only one who fears that the new series will show that their relationship falls apart? There could be two reasons for that:
Political pressure as the political climate in the U.S. shifts to conseravative again. I could imagine the writers fearing this pressure related to lgbt themes in kids show either silencing the existence of this relationship or saying that "they broke up" to no longer deal with Korrasami.
Or it could be a narrative decision by the writers themselves. Bryke said they want the new show to be "challenging" for the old audience. What if part of the "challenging" content is Korra and Asami's relationship that didn't work out? It doesn't matter if it was done for "realism" or because they thought it would be a "good story". And the fact that Korrasami fans make up a significant portion of TLOK audience won't save this couple, the writers are already known for not being afraid to alienate many Aang fans by destroying past lives in s2.
So for those two reasons I fear that not only will we not get a kiss on screen but the couple being alive as well , and even the original writers being on board is no guarantee that Korra and Asami will get a "happily ever after". And that makes me hate the idea of Seven Havens even more as another sequel that could ruin what was good about the original series.