Building links to your hub will definetly help with increasing traffic form the search engines. Keep in mind that you have to put your links in your anchor text (text where the link is in) in order to rank for your keyword.
Also, Google doesn't count links that are tagged with "nofollow' you can use a firefox plugin NoDoFollow to check whether links are dofollow or nofollow.
Depending on how comptetive the keyword you are trying to rnak for is, the more links you'll have to build to rise in the search engines (and grab the visitor's attention).
Generally, the longer the keyword phrase you are trying to rank for is, the easier it is to rank for that keyword. However, the longer the keyword phrase is, the less traffic you will generally get.
If you want some good estimates, search "google keytool" in Google and you'll find their free to tool to determine how many searches a keyword gets every day.
Hope that helped, have a good day!