Serious question. Historically have there always been more Russians and Germans then Poles?
Yes, the tribes that made up Russians and Germans have been far more numerous, in fact the difference is smaller now than it was in early dark ages.
It wouldn't be fair to blame wars and such on the population differences because along with Poland, Germany also lost a few million of it's men and women and so has Russia.
Not even remotely close to what Poland lost though.
Will the Poles die out eventually?
If the current trend keeps that way yes, but Germans will get there a solid century before us!