Most Nazi officials, especially the authorities of the General Government (which administered the rump remains of Poland) including Hans Frank, viewed the forced resettlement of 4,000,000 Jews to Madagascar as being infinitely more desirable than the heretofore piecemeal efforts at deportation into Poland. As of July 10, all such deportations were cancelled, and construction of the Warsaw ghetto was halted, since it appeared to be unnecessary... It was envisioned that the Third Reich would win the Battle of Britain and invade and conquer Great Britain in Operation Sea Lion--then the British Fleet could be taken over by Germany and used to transport the Jews to Madagascar. How the native Malagasy population of Madagascar was to fit in with this plan was never elaborated upon...
The resistance of the United Kingdom during the Battle of Britain, and Germany's failure to achieve a quick victory by September, were the ultimate causes of the Plan's collapse. The British fleet would not be at Germany's disposal to be used in evacuations, and the war would continue indefinitely.