I dont feel we should go after S. SMith for many of the reasons listed above.
1. We rarely use 3WR sets
2. We need to get younger players some playing time. (PAtton, drafted WR)
3. Crabtree, Boldin, S. Smith, V. Davis is a lot of egos to have on the field all chirping and complaining if they aint getting the ball.
4. We run the ball the most in the league. 2 good WR (Crabtree and Boldin) + 2 good TE (V. Davis and hopefully McDonald) should be all we need.
Now of course you cant prepare totally for injuries that occur in the future. As we saw with Crabtree out, teams can shut Boldin out and were screwed.