I guess it would depend on how you use the blog. But, up to now, I've never seen anyone actually link their blog entries in any EVE chat, nor have I done so. Thus, I don't think it is something that actually happens, or does so often, and thus should suppose no problem to the actual idea of IC blogs.
Not to mention that, if people accept that the reply to a given question is a blog entry, then they deserve that reply. A conversation is a matter of two, so if you accept the link, don't go then around complainig. No? And, before any doubts arise, I'm not referring to anyone specific (as I said, never saw anyone use a blog entry as an IC reply), just to the theoretical situation.