On the con side, I can see how it's frustrating, if you're used to checking all of a user's memes, to have to click through the various stream options on their profile to do it, now. It seems like more effort.
On the other hand, looking at it as a benefit for the site overall, it might take away some of the advantage that "known" users have over lesser-known users (who don't have as many people coming to check their profiles). It might mean that in streams other than 'fun', you won't have as much of an advantage by being a user people already know. This could level the playing field to some degree, and mean that any user's meme can do as well as any other, on the strength of the meme itself, in those sections. If that happens, that might not be a bad thing for the site.