At any point after the WW2 deportations--completely impossible. After the deportees came back there were many cases in which ethnic group A occupied areas formerly occupied by group B, and since Group A got back first Group B couldn't displace them. Chechnya and Ingushetia just had a months-long legal brawl over land apportionment, which Chechnya has largely won (it will soon be annexing portions of Ingushetia). This has been met with large protests in Ingushetia's major cities. Chechnya also has a running conflict with Dagestan over the Novolaksky District. And then, of course, there's the Ingush-Osssetian conflict, triggered over overlapping claims that first arose during the chaotic 1920s, when the Soviets wanted control and supported whatever faction offered to cooperate.
The 20th century hasn't been kind to the area, and as groups struggled for survival they antagonized each other quite a bit. A sense of Caucasian confederal unity would have to either arise in the 1700s or 1800s and then remain, or never arise at all.
The 20th century hasn't been kind to the area, and as groups struggled for survival they antagonized each other quite a bit. A sense of Caucasian confederal unity would have to either arise in the 1700s or 1800s and then remain, or never arise at all.