There was a talk by Yehuda Katz where he predicted that most plugins that modify the router in Rails 2.3 will either be unnecessary in Rails 3 or reduced from 200 lines to 2.
With what I've seen so far this seems to be absolutely the case and shows how much one can gain from switching to a clean architecture.
I have been occasionally building Rails 3 and trying it - can't wait to switch work projects (probably do this a month after official release). There is obviously a lot of talent on the rails dev team and it shows with the willingness to keep improving the architecture.
With what I've seen so far this seems to be absolutely the case and shows how much one can gain from switching to a clean architecture.