Firstly I don't see how France and England could ignore it. Germany had already gone after places like Austria and Czechoslovakia. England and France let this slip because Hitler's excuse was that he was simply reclaiming land that previously belonged to Germany but which was taken away from Germany after WWI and the Treaty.

However, both of the allied countries had alliances with Poland. They could not stand idly by and do nothing while Hitler went marching next door to plunder their ally. If one went to war (say France) England would have to go to war as well, because if they didn't, the French would most likely start questioning where the English loyalties lay - with freedom or fascism.

Secondly, assuming that France and England REALLY DID NOTHING - I don't think Hitler could win a war against the Soviets, or at least, against Russia, anyway. Napoleon tried...and failed. And when Hitler DID try in the later years of the war - it was a disaster. And this was after he'd gone through the other countries and probably swelled his ranks with forced conscription.

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WWII-era pen-advertisement
P-51 Mustang fighter-plane.
Parker '51' fountain pen.