Hmmm, well, that's strange.
The first 'source' for this is "holocaust-history.org", which, we'll look at that in a moment.
>web.archive.org/web/20080314131150/http://holocaust-history.org/der-ewige-jude/hitler-19390130.shtml
But its weird, it doesn't say QUITE what the wikikpedia says…
WIKI:Today I want to be a prophet once more: if international Jewry succeeds in plunging the nations into another world war, the result will not be the Bolshevization of the earth, and thereby the victory of Jewry, but the destruction of the Jewish race in Europe!
HH: If the international finance-Jewry inside and outside Europe should succeed in plunging the nations into a world war yet again, then the outcome will not be the victory of Jewry, but rather the annihilation of the Jewish race in Europe!
Well, not that far off I guess. Here it is in German, in case you were interested.
HH - GERMAN: Wenn es dem internationalen Finanzjudentum in und außerhalb Europas gelingen sollte, die Völker noch einmal in einen Weltkrieg zu stürzen, dann wird das Ergebnis nicht der Sieg des Judentums sein, sondern die Vernichtung der jüdischen Rasse in Europa!
The first point I'd raise here is… I don't see Hitler saying ANYTHING approximate to "If X, then WE WILL DO Y". Think about what he's saying here: "I'm telling you guys, if the Jews create another world war, its gonna result in their extinction."
I don't think that quite amounts to anything GENUINELY supporting of the idea of a plan being implemented years later to exterminate the Jews, do you? I mean, I'd probably say that too about the Jews (makes sense, no?), doesn't mean I'd be planning - or morally/ethically willing to take part in - an extermination program gassing women and children, Jew or otherwise.
Also, keep context in mind here dude: The Jews started boycotting Germany in 1933. You're talking about a speech from 1939, January.
September 1st 1939 was when Germany invaded Poland, September 3rd 1939 the UK and France declared war on Germany (nominally to protect Polish sovereignty, THE SINGLE GREATEST POINT OF THIS CONFLICT; see: Post-Yalta Poland). So, at this point, a EUROPEAN war has already started, is several months deep, and the Jews are trying to get everyone they can into the war…