For one thing, one has to consider the integrity of the piece – given the ending of the first series, what reason is there to reunite our three leads again? It’s obvious that this is happening because of the success of the first series, and it’d be churlish to denigrate the follow-up on that basis – but the question as to whether it’s the only reason for a sequel is worth asking nonetheless.
Perhaps I’m just biased – after all, I was one of the few people who didn’t love The Night Manager, or even particularly like it. From the nasty fridging as the show began, to the thin writing and poor characterisation of Tom Hiddleston’s Jonathon Pine, there were quite a few flaws to the show that stood in the way of my enjoyment of it. And, indeed, they continue to stand in the way of my interest in a sequel.
Short answer: Probably not.
Long answer? Well…