A lot of it depends on your motivation for writing the hub.
Clearly if you are writing solely to earn money from viewership then you might elect to delete the under performing hubs.
Personally I look at my writing as a "body of work" very similar to an author of books, a film actor, or recording artists. :-)
Everyone wishes they could undo something that made sense to them at the time they did it. ha ha ha
However in the case of posting hubs we do have the ability to edit them or delete them. If you stand by what you wrote or feel that it is worthwhile (especially if it was an advice hub) it may be one that helped someone get through a rough patch. You never know. Popularity isn't everything.
reena_yadav made an excellent suggestion which I have been known to do from time to time. Change the title to make it more search friendly or interesting.
You can also modify the catagory for example the hub is listed under (gender relations - single- online dating)
If the article is geared more towards women you may change the catagory to (gender relations - advice for women) or men whomever you feel might be most interested in the subject matter. The goal is to refine the catagory so that someone who is looking for hubs on a specific subject matter can easily find it.
You might also try not being "too specific" and simply list the catagory as "gender relations".
If your lower viewed hub is related in some way to one of your higher viewed hubs then you can edit the higher viewed hub and insert a link or hi-lite a word that will allow the reader to click and read the related hub. There is also a way set up your lower viewed hub to be listed in the side column under "related hubs"
Whatever you decide to do is fine.