Speculations can lead anywhere including beautiful places, if you know how do manage them.
Correct, timing is essential.
However, to take a decision fast we need to evaluate the alternative and the available options otherwise the fast decision cannot happen fast or it is a blind jump. Usually, the second.
Conclusion
Speculations about where to go after SailFish OS can be interesting because it means that people who are speculating realized that SFOS is not the way whatever Jolla does.
Speculations about where to go after Jolla Oy are useless because they missed the main point above: SailFish OS is not the answer whatever is the question.
Not for me, at least - not any release I saw up to this moment, at least because I use UNIX systems as end-user and as developer and I know what I am expecting from a such a systems and what I am not going to accept.