Partridge, the answer lies in SkittleCats' response. He expressed the opinion that the existing young players are "3+ years away from being able to do what we hope they can do". Lonergan has at best one more season, as does Rivers. Taylor can't do it all himself. And Enright is likely to retire at the end of 2014.
He also said we have an obvious need, and he fills it NOW.
Go for it. There is a real danger our "best-22" is under 30 players, there's always room for one more. Can't wait to see a defence with Rivers, Frawley, Taylor, Lonergan and Mackie, as well as a ruck division of McIntosh, Simpson and Blicavs, and a forward line of Hawkins, Vardy and Kersten.
The speed will be just awesome.