There is ample time and distance, yes, that if the authors want the Coyotes to have forgotten and forsaken their bond with the Wolves, then it will make plenty of sense for it to be forgotten.
However, I maintain that it is entirely plausible, if the authors decided that they wanted the bond to be upheld, that the way clan culture works could see it remembered. Sibkos could be taught of the wolves as long lost brethren, if the coyotes wanted to perpetuate the idea. the legend could be upheld.
Hundreds of years have passed since the annihilation of the Not-Named, and yet, all people of the clans know what name not to say. The (awful) legend has been preserved, intentionally. The same could be done for good. Especially, if the Coyotes were feeling estranged from the other Home Clans.
As for that Example of dubious canonocity in CampOps, to which I already referred in this discussion, I was under the impression that it was a move to get room to grow, not because they had been forced from the homeworlds. But either way, they clearly aren't happy with the status quo in the homeworlds, if there's any canonocity to be had in those examples.