If that had been the case Versailles would have been rejected by Germany, which it nearly was, Matthias Erzburger its principle advocate probably arrested, and a huge outcry not only in Germany arising the "The Allies had not kept their word of Peace with Justice".
Then anything could have happened.
The US. army had largely gone home, the last troops leaving Brest just after Versailles was signed. Woodrow Wilson for domestic reasons needed to demobilise as fast as possible.
Also its too late the Bolsheviks are in power in Russia and the Germans may well call them in.
There will be huge domestic problems in Britain and France restarting the war, and there may well be mutinies in the British army.
Haig himself warned of this, saying that his troops didn't mind fighting to win the war, but not for endless moves into Germany.
A problem is Wilson - he may not return (and Congress may not allow him to).
He believed in "Self-Determination" FOR Germany (it's a nation) but not for A-H (it's not a nation).
The break-up of A-H, - the treaties of Trianon and St.Germain are very much his personal baby. He wanted to create nation states with clearly defined boundaries of national lines there.
Of course, you couldn't, but he wanted to use this 9and Prohibition) to get a Third term in the US.
(Lloyd-George - "but we never intended this idiot to believe this, it was just propaganda to get him to fight the war")
Over Germany Wilson would not allow it to be broken up.
Another problem is the Reparations, which the allies wanted and needed. No industry in Germany - no money for Reparation payments.
Of couse there is a simple answer, if the allies had manage to restrain their self-righteousness, as well as controlling Wilson, and left A-H intact, there wouldnot be a problem. Arthur Balfour, the British Conservative leader had warned of this andnot a few French were agianst it as they saw it utterly destroyed the balance of Power in Europe and germany would dominate these weak states.
If the war goes on till the autumn of 1920 as the British General Staff thought it would, then there could conceivably be a Central Powers win.