Not if it's going to be an accessibility problem, no. Implementing some useful features that other blogging systems have is fine by me, but superficially imitating the aesthetic of Wordpress isn't going to make Dreamwidth journals more like "serious" blogs. A journal can be a blog, if you want it to be, but that depends a lot more on the content than on trying to look like other systems. Dreamwidth should play to its strengths, and one of those is really good, built-in accessibility. (If it weren't for the comments, I would have thought that your proposal was ok.)