Sort of agree, although I think we could have the same effect if we sign a really good LW allowing us to rest Balotelli so he doesn't have to play in that position. Balo is definitely better in the CF role than the LW/Inside Forward (IF) role.
Somebody like Petrov would be good without the cowardice (but with the pace) and with a few more tricks who wouldn't mind tracking back. OK, so nothing like Petrov then :D
That would give us a choice of Balo, Dzeko & Aguero to start in the CF position and keep the other 2 on the bench to bring on if needed. Dzeko can only really play CF but Aguero could come on as CF, in the hole or RW/IF (I think) and Balo could come on as CF, LW/RW - IF.
This gives us more options and rotation than signing a dedicated striker.