That's not really how hubski works - stuff you post is either seen by people that follow you, or by people who follow your post's tags. Time isn't as much a factor as, say, reddit. So people who care will see it, no need to bump. People also do revive old discussions again when something interesting can be said.
Yes. YES. This. A thousand times this.
We are not Reddit. Reddit is great. This is not it. Posts come and posts go. Sometimes I have posted stuff that has been life changing for me and it doesn't get a single share. And do you know what? Who cares.
Also - just yesterday I was reading through posts that were 1000+ days old.
Great content is timeless.