The Germans aren't taking EVERYTHING. There will likely be border adjustments, the use of French ports for the German fleet, the protectorate of Morocco goes to Germany, and France finds itself in a customs union. Germany would rather reduce them to an economic vassal to ensure there is no 'next' war as well as let the French keep their colonies (let them do the work while Germany reaps the benefits). Germany's main goal will be Mitteleuropa which no one will be able to prevent.
Who is going to stop them?
Take a look at the very moderate September Program.
France was going to be charged a 10 billion mark indemnity and to assume 33 billion in German debt
Then look at the plans for Belgium and the Netherlands. Even neutrals were to be put under the German heel.
And how are the British going to stop them? Britain needed the help of France, Russia , Italy and the US to win the war
How is she prevailing with France and Russia defeated and Italy either defeated or allied to Germany?
The idea that Britain can't lose because her fleet will protect her fails the most cursory of examinations. The British cabinet understood and that's why they went to war- not for Belgium but to keep their Empire