I would not say forced, but recently, I have deleted some of my hubs. The reason being that all my hubs form a subdomain on hubpages. I believe that in the same way, a chain is only as strong as its weakest link, Google looks at websites and subdomains and kind of 'marks them down' when there are weaker or substandard pages.
When a hub ceases to be featured, it quickly becomes de-indexed by Google. You can check this for yourself by copying a sentence from an unfeatured hub and putting it into Google's search box. Add quotation (") marks at the beginning and end and hit the search button - Google will return no results! Therefore, the only people who could find non-featured hubs, would be other hubbers and those already on the site.
I have fixed up a few of these non-featured hubs, rather than deleting them. I have done the keyword research again, added more titles, text capsules and other capsules like video, Amazon or a poll for interest. But where I feel that it is not worth expending the effort, I have chosen to delete them in the hope that this raises the standard of the remainder!