It'll be hard for your pack to dominate if you get any injuries to your starting pack. You may have a great starting pack, but the sheer cost of that starting pack plus inglis has left your depth severely depleted. Souths have built a team of individuals, they haven't looked at the big picture and looked at building a "team", until they get rid of the mentality that superstars will win you a premiership, even if the rest of your cattle are garbage... I think they will continue to struggle.
You also need halves who can direct your forwards, something which Sandow and Sutton have shown an inability to do. They typically don't think two or three plays ahead.
Souths are again a fringe 8 side at best this year IMO. They've focussed their cash on the wrong place yet again, and I don't think Lang has evolved with the game, his tactics are no longer useful in the modern game.
In saying that, I hope I'm wrong, I'd love to see Souths make a play at the finals. Even if it makes some of your fans even more unbearable. I just can't see it happening this year though, they'll probably have a strong start to the season, but any injuries will quickly put out the fire, especially when you have the likes of Asotasi, Crocker and Taylor on the payroll.