Suffice it to say that even Peter Longerich, the historian cited by Michael to support his claims, stated the following:
In the most serious crisis of the war thus far, the participants at the conference were given the impression that the RSHA was planning to have the mass murders started in the various occupied areas, leading to a 'total solution' ('Gesamtlösung') that was to be developed over the long term.
So without rehashing the debate, let it be noted that the most important witness to Wannsee, Eichmann, confirms that what was discussed was genocide, and that, to my knowledge, there is no credible historian who offers a counter-theory.
So with that in mind, with Eichmann's confirmation that "evacuation" at Wannsee was a euphemism for genocide, we can read the minutes of Wannsee as saying:
"Another possible solution of the problem has now taken the place of emigration, i.e. the liquidation of the Jews, provided that the Führer gives the appropriate approval in advance."
Wannsee was about extermination, and, according to the minutes, it required Hitler's prior approval.