Future timelines from yesterday's stream. Minna estimated that Adventure 2 will be going on until next year, apparently sometime early 2022. So, we have time, but not indefinite time.
She also mentioned that the story will end in something open like Adventure 1 was, so that if she in some point in the future feels like it, or "can't come up with any other idea" she can make another adventure. Upon which point I commented that she'll not be likely to be killing everyone off, at which point she added that it could of course be a backtrack to the prologue, or another time jump, or whatever, and that we can't trust her not to kill our team
Of course it's not something she'd comment on, but I'm hopeful at least some of the characters will survive
(I'm HOPEFUL they will all survive, but you never know...)
She also confirmed when asked that book 4 printing will happen and she's also prepared to print Adventure 2 into physical books, if Hiveworks wants to and feels it's a viable business at the time. I personally doubt it will happen, as it would be probably three books making the printing at very minimum a three year project (likely closer to 6) and the demand is likely to be diminishing after the updates cease.
Furthermore I think she was talking about her next idea when I joined the stream, I'll try to listen to the recording to find out what it was.