They will need to hit the ground running TSR. That means being able to replicate and continue the form with which they finished this year. At the end, they were arguably the best performing team in the Aussie conference.
I think Slim has pretty much nailed the starting side for 2019. Personally, I don't have any issue at all with Carter partnering Rory in the second row. I noticed that after he came back from his injury he was playing with noticeably more vigour than before. He has always been the lock in Aus with the highest workload, but he has lately been making his tackles hurt more and has added substantially more grunt to his work with the ball. I'd say that either McKellar or Cheika has been in his ear about playing more aggressively and he is delivering. Pity that Richie elected to go o/s just when he was showing his full potential.
How successful they'll be next year will largely depend on the quality of backup players. Injuries happen.
Front row and hooker will hopefully be well stocked with McInally, Makin, Lloyd, Alexander and another quality LHP in the roster.
Lock should be adequate with Enever and Swain as backups.
Potential bench players in the backrow include McCaffrey, Cusack and Hyne. We know how injuries this year affected the back row, so we probably need another back up player as insurance. Perhaps Pat Sio or Angus Allen or Rohan Perry?
No 9 looks ok with Lucas and Lonergan to back up Powell.
No 10 is covered now that Christian has re-signed, but still would like to see Deegan brought over for a chance at Super Rugby. Apparently, Hawera has been killing it in JID and is almost solely responsible for the Eagles' late surge to make the finals.
The Centers are lacking for reserve power atm. Simone has come in to replace Godwin but I'd like to see a quality player like Paia'aua or Meakes added to bolster the backline.
One more outside back to cover wing and fullback should also be on the shopping list.
Boost the reserves, and the Brumbies will take out the Aus conference next year, no worries.