I have been thinking about this quite a lot and, like many of you, I am really uncertain what to do in the coming months. But recently I have been thinking of returning to SK actually.
Main reason would be 45k for *Gold (if your address is outside Scandinavia), 1,5x earnings for economy extra on SK-flight (fairly easy to get through Option Town for not so much money and then of course there is also Option Town all the way to C for a little more), and the fact that I still earn miles with my EB Mastercard from time to time (and transfer from Amex). So, for a Swede living in Korea flying quite a few times Europe-Korea, it can make sense. Another benefit is that SK does not charge YQ on their own metal.
Downside is that LH fares are becoming increasingly non-earning (only reason to stick to Miles and More) and that UA/CO often only earns 0,25x meaning I will have to fly AC whenever I travel to the US.
But yes, I will definitely miss DC. I have not seen that many people discuss SK as an option so I am curious what you think?