Will I replace Movable Type with WordPress? Maybe. They’ve made a lot of progress with 2.0 of WordPress. It’s a lot cleaner than I remember. They’ve tossed in a bunch of AJAX and the like that makes the interface a lot smoother. The themes are a lot easier to manage (picking preselected themes, that is) than MT. Plugin management is also better.
As for downsides, there are always some. First, the templates are more complex in WordPress. Movable Type’s templates are like editing HTML. Here, it’s editing PHP. Second, MT allows multiple blogs per installation (not that it matters with my current setup). Also, there’s the comfort level. I’ve become comfortable with Movable Type over the past year-ish. It’s a big step, but, it’s one I might have to take.
I’ve shown this to one of my other users and they like the WordPress administration side better. So, we’ll see.