I'm all for trying to train Folau up to play 13 as well as 15 and the wing. It can't hurt to add another string to his bow. Combined with this we'll have AAC (Adam Ashley-Cooper) getting more training to play 12. His distribution game needs improvement in the same way that we saw Horne's flourish last year at 12.
The Tahs have plenty of quality backs and when everyone is fit it will be tricky getting them all game time.
I think it is important to ensure there is enough versatility that when there are an injury or two, we're not left with a Wallaby on the bench and an EPS player in the starting backline (or similar).
If you start next year thinking that Horne can play 12 or 13, AAC (Adam Ashley-Cooper) 12, 13, 14 or 15, Folau 13, 14, or 15, Crawford 14 or 15, Beale 10 or 15, Foley 10 or 15 and Lance 10, 12, 15 then we should have some pretty good options.