The Balfour Declaration was the result of months of talks and negotiations, all of which were specifically about having a Jewish homeland in Palestine. For these talks to result in a declaration of support for a Jewish homeland in Newfoundland would come completely out of left field. Conversely, if those talks have the British government pushing a homeland in Newfoundland from the beginning, I am not sure the proposal would get so far as a declaration--with a British (or French or international) Palestine on the horizon, Zionist attentions will be very much directed in that direction, and Newfoundland will pale in comparison. Something could come of it, but I suspect it would go the way of Zionist Uganda--although if the Holocaust isn't butterflied away by this, perhaps someone will dig out the old plans and establish a Jewish homeland there during or after WWII a la Sitka in The Yiddish Policemen's Union. The impact on Palestine of not having any British commitment to establishing a Jewish homeland there will be interesting, though. We could see the original Sykes-Picot provisions for the region going through, with most of the region going under international administration while Britain takes control of the southern portion.