Blogs never get comments. It is one the most overrated options in that scene.
The point of connecting a wordpress to discourse is expanding content of blog and give something to read for discourse community, because there we can get comments.
So, the direction is not from wordpress to commenting technically made by discourse, but raise discussion in forum and show it in blog in right context. Big difference.
But if you don’t know (or you won’t do the job as content creator) how to get active community to discourse, you don’t get any comments either. Then the best solution is closing commenting totally, not installing Discourse.
The worst scenario is a blog with comments and the author of blog has abandonded commenting totally from his/hers side. That is a (common) situation where technical solution of commenting system just doesn’t matter at all.