WPMuse - 9:15 pm on Jan 2, 2013 (gmt 0)
Update! After taking the time to help the site owner understand the difference between how pages and categories/posts are organized and therefore displayed, I put up a bunch of test categories and posts.
Turns out he could navigate them just fine -- very easily in fact! I'm thinking the struggle and push-back we initially had was a lack of confidence that by not having every article as a page in a long list in the sidebar that things would become overly difficult for him to "see" his own site.
Now that he has experienced what I set up and explained -- all is well. And, his site will be more intuitively organized and user-friendly for the sighted too!