You're not able to change the routing in such a way, because then users whose names are only numbers cannot be accessed.
Best bet is to set up a rewrite rule in nginx to send users requesting /user/\d+ to /uid/1
Right now the entire box goes to the post itself (or should, anyway).
We can see about turning the username into an anchor to the user's profile.
We totally changed the category view so this is moot now The user images link to the user profiles now.
hmm.... now it's look much better...
Thanks @kartic! Glad you approve