As much of a Korrasami shipper as I am, it saddens me to say that Korra and Asami will not be endgame.
First off, LOK is being advertised as a children’s cartoon show (which obvs has evolved into so much more), and as such, has to be within certain boundaries, including not having same-sex couples (never mind the killing and violence, god forbid a guy gets with a guy or a girl gets with a girl).
Secondly, the main people in charge are straight men, and they probably have their own preferences and fantasies about who should get with who, and given the choice, they will place the guys with the girls (cuz they probably fantasize that they are the leading guys who get the leading girls).
All this Korrasami stuff we are seeing (most recent example being Asami: “I can’t wait to see her”…. oh the feels!) is most likely a conciliatory gesture from Mike & Bryan, giving us shippers something, anything, if not a canon pairing. They want to let us down gently, given that they are setting up a Makorra endgame.
Let’s face it, people. Korra is gonna end up with Mako. Heck, there were even hints of Mako & Asami flirting again (back in Book 3). So as much as it pains me to say it (because she’s not gonna be with Asami), let’s just be happy for Korra with whoever she ends up with. It’s kind of obvious & disappointing at the same time who it’s gonna be, but Mike & Bryan are just taking us along for the ride.