Would Britain shift its main effort east?

If Gallipoli succeeded, would Britain hold more troops in the east and attack Germany from there?

That becomes plausible, with France dominant in the west and Britain financing and leading a multinational eastern army.

The counterfactual creates room for a British-led campaign from the eastern Mediterranean toward Germany and Austria-Hungary. Russia would provide mass but remain dependent on British money and material, while France carried more of the western burden. Edmund Allenby appears in a Wellington-like coalition-command role. This is a possible Allied division of labor made available by success at Gallipoli, not a claim that political agreement or unified command would follow automatically.