I'd say in a way this could avoid feature bloat, in the sense that new operations can be added as "frequently used snippets" instead of core commands. I wonder how this plays with replication/clustering, though.
Avoiding feature bloat is indeed one of the goals of this move, as explained in the blog post. Several users are requesting features in the Google Group, others like me maintain forks. With user-defined procedures, hopefully we will no longer need all this.
As for clustering, Antirez also explained in the blog post that it will work as long as you use a single key per script.
