It is probably an overstatement to state that Hitler considered the Jews a threat; otherwise he would have dealt with them more aggressively in the beginning. He rather considered them a useless nuisance, akin to vermin that the country would do well to be rid of. In Mein Kampf he compares them to "maggots."
Was there any excrement, any shamelessness in any form, above all in cultural life, in which at least one Jew would not have been involved? As soon as one even carefully cut into such an abscess, one found, like maggots in a decaying body, often blinded by the sudden light, a kike
His initial policy as Chancellor was to isolate them, encouraging the German people to not do business with them, and later depriving them of practicing certain professions. In terms of ridding the country of them, he first considered exporting all German Jews to Israel, but was thwarted by the British who were afraid of an Arab rebellion if the Jewish population increased. He next considered shipping them to Madagascar, at that time a French colony; but the French resisted also. Finally, he considered exporting them to the far reaches of the Soviet Union. Only when all of these "remedies" proved impractical did the "Final Solution" rear its ugly head.
Although Hitler used anti-Semitism in his campaign to secure power for the National Socialist Party, his power did not grow as a result of his actions toward the Jews after his election as Chancellor. Under the Constitution of the Weimar Republic, he had already been granted dictatorial powers under the Emergency Powers provision following the burning of the Reichstag. At that point, his power was complete. His policies toward the Jews were an exercise of that power, nothing more.
It should also be noted that anti-semitism was not limited to Germany. When German troops "liberated" Poland, many Polish people attacked Jews in the streets, killing many of them by hitting them with broomsticks which had nails embedded in them. Hitler's actions were largely a reaction to a pre-existing attitude toward European Jews.