What if the ANZACs and other allied forces were pushed into the sea by the Ottoman troops at Gallipoli. Would this end the war sooner or would the Entente push through this loss and still achieve victory.
As in an immediate disaster on the first day as opposed to eight months of trench warfare and evacuation? Dieppe by the blue Mediterranean?
Well for one thing the Ottoman's might decide to get aggressive in the general direction of the Suez Canal, which was supposed to be a major reason for Britain fighting a war in the area at all. It would certainly make anyone already worried about that happening more fearful.
It would depend on how it played in London and Paris. Would it be seen as a reason to abandon Churchill's dream of knocking the Turks out of the war and turning the various Balkan armies against the Austrians. Or would it be seen as a threat to the supply line to India etc from a nation that the Entente should realistically be able to destroy quickly if they put in any real effort at all?
One reading would lead to a transfer of forces to the Western Front, the other to a transfer away?