I wonder why human beings are so important in the conflict between the fallen angels (demons) and Jehovah

Assume that the angels existed long before humans existed, let's say millions of years, then at some point some angels (especially satan) started questioning God, but I assume that it only burst into a full blown conflict once Satan compelled humans to sin. Why did it take so long for them to rebel and why are humans such a crucial aspect in the situation when we are so small and powerless in comparison to them?

I don't know. Maybe there were conflicts and issues that existed and ended before we were created. Then perhaps, even after this conflict is ended, new ones will emerge eventually, even if a very long time goes between them. Perhaps they won't be as bad, but who knows. I find it an interesting thought because us christians often think that the current conflict is the final one and that when it ends everything will be permanently conflict free, that might be the case too, but again, who knows. ☺