I have been thinking this for a while. There is far too much mystery still around the Night King. No doubt one of the spin offs will be based around the history of the Night King.The babies that the Night king was taking - What happened to them? was he trying to make new children of night not bound to his fate as he had already seen his demise?
Breaking Bad? The ending was perfect.You'd be hard-pressed to find a long-running show that has a good ending, that long-term fans were actually happy with.
I can't think of a single one. Either the ending gets rushed, or the show gets drawn out far beyond its means.
TBBT came close tho.
Everything has to end sometime. If you spent all that time watching something that you didn't enjoy, that's kinda on you.
You are welcome to try and do better...