I feel like I hung on with Disqus longer than most, but it's time to let it go. Disqus was a nice comment upgrade back when Blogger had a very limited comment box. In recent months, Blogger added some nice features to their comment function and it no longer made sense to put up with the quirks and weaknesses of Disqus.
Disqus was supposed to be syncing comments back to Blogger all this time, but it turns out that 5054 comments were not synced. Thankfully, the Disqus people have a sync process embedded in their dashboard and I was able to get all but 25 comments to come back to Blogger after running the process at least a dozen times.
In theory, when I uninstall Disqus from the blog, every comment except for the 25 that have somehow been lost should be right where they should be.
Cross your fingers...
UPDATE: It's done. There are a few issues. Comments are definitely out of order in some posts and a few are showing up on different posts than the reader intended. I'm okay with it.