Mike Farrell of SportingNews.com believes so:

Ronald Johnson, USC. Stunning how another USC guy makes this
list (they had two in the running back category I did in late March).
Johnson, in this scenario, is replacing the departed Steve Smith — not
Dwayne Jarrett. Smith was a superior talent for Southern Cal and will
be a very good NFL player. However, Johnson is already the same size as
Smith. Johnson will get bigger and faster, and is a pure game-breaker.
The only way Johnson doesn’t surpass Smith’s tremendous production at
USC is if he moves to cornerback, where he would also be an upgrade. Verdict: Better.

I personally think it’s a bit of a stretch, but I will admit that I never thought Steve Smith would come close to Keary Colbert.  Based on what I’ve seen of RoJo, there is no question that he’s the greater game-breaker, but will he be as consistent and reliable as SS?  I’m not so sure about that one.  Opinions?