A few SEO related things to think about:

Does the page have inbound links?
Does the page have organic traffic?
Does it rank on the first page of Google for any queries?

If you answer yes to any of the above questions you need to think about the cost of removing the page. Yes, you can 301 redirect them to a new page, BUT if you want to preserve the rankings, you should keep the page as similar (from a content perspective) as possible.

If you are making major updates to the site architecture, you should look at Google's recommendations for moving a site with URL changes: https://support.google.com/webmasters/answer/34437

This will also help you keep your rankings.