Did Gandalf have a Plan "B"?

[Sarumian]

Originally Posted by narfforc

I also wonder if The Valar had a Plan B if all the Istari had failed in their mission.

Which means, Sauron wins control over Middle-earth and eliminates, seduces or captures all other majar around. If he was happy with ruling only that continent, they probably could send another mission just to keep him busy with home affairs. But if he is able to consolidate all resources and attack the West once again, an atomic bomb will be the final solution as it happened to Numenor once upon a time