A redesign is a good opportunity to evaluate the pages of the site and what they are doing. You will need data for this such as recent Google Analytics data. Any page that you decide to get rid of because of low traffic to the page you will want to redirect to the page above it, or a consolidated page that contains similar information. You can also allow the pages to 404 for a few weeks to let Google know for sure that you have rid the site of them. Depending on how high traffic of a site it is, Google may not be crawling the entire site anyway.

With that said, I would not worry about including all 188 pages unless all 188 pages are providing value. A large portion of most websites are doing more harm than good when it comes to SEO because of the low value of the pages. Google looks at that. There is a difference between a site being content rich and content saturated. Hope that makes sense.