Whether that makes sense depends on the context. Particularly in the case of someone submitting a link to their own (startup|open source code|blog post|etc), people often ask questions along the lines of "what does the author think about X" and the identity of the person replying matters a great deal to whether a reply is meaningful.
It should be obvious whether such an answer sounds authoritative or not, and it sounds like a comment could still be downvoted once endorsed. So I don't think this is as big of a problem as users endorsing (or not endorsing) based on username.
