> but this isn’t exactly a great start to a productive conversation.
My thought entirely. Perhaps you think I'm in the camp that believes all good ides come to fruition.
My position is that the world is complex, there are "good ideas" that have a time frame, should they not be implemented with that time frame their time has passed and they're no longer good ideas.
That said, my response above stands - just because a good idea exists and is timely, it does not follow that failures to implement cannot happen, nor does it mean that at least one attempt must succeed, further there are cases with a time window, I have a great idea for improving horse drawn ploughing, for example ...
Also, see @II2II 's peer comment above, another take on possible happenings.
Where I take issue with the content of your comment is specifically:
> This logic means ...
the reasoning you use there eludes me.