You can't have an entire backline of Camacho's though. For what he has in effort, he has his limitations in that he is lacking in physical gifts. He's not particularly quick, not particularly elusive nor particularly powerful and he can't score tries within a blunt and limited attacking system outside poor centres who struggle to create any space like Bosch and Fernandez.
I also feel that many are overrating Imhoff's perceived weakness which isn't enough to ignore his strengths. Ireland, Wales, England or Scotland could all pick better defenders in the back three than Zebo, Cuthbert, Ashton, Wade, Hogg or Visser. But they don't as you don't pick wingers simply for defence which unfortunately seems to be the Argentine attitude. It's a balance between the wingers, Camacho and Agulla doesn't work, their respective try strike rates back this up.
I also feel you are overrating Camacho. I doubt any of the Lions nations would select him in the lineup. He has had notable bad matches for himself in his career such as Ireland last year, and considering he's nearly 30 years old and only really got in the team since 2010 it would suggest he hasn't always been that highly rated in Argentina either considering some pretty average to poor wingers (in the international context) were selected ahead of him for a long while. He's just a repeat of Lucas Borges, perhaps a little solider.
Argentina need more than the likes of Camacho, Agulla, Aramburu, Borges type wingers, and unlike before they now have other options. The only reason Camacho and Agulla are retained is due to the habit of picking that type of winger for the previous dozen years and Phelan can't change. All the other top 8 teams would probably select Imhoff and Montero from the Pumas current player base, especially if the latter finds a decent team. I can't think of any other 5'9" limited choppers who have reached international rugby with other nations. It's a uniquely Argentine type of wing.