Very close.
I suppose we also have to factor in how much our rivals will improve over the summer as well when considering what we need to do to build a winning side, but I pretty much agree with that - one or two more top-class players in key areas, and the rest is just depth. I still think we may need about 6 players, but not all of them have to cost the earth - I think it's doable, even in a WC year...