Russia may fall earlier then OTL. Because they lack the USA entry to keep them in for a time.Apart from Russia, which ones, why and when?
Italy may or may not feel that they have to get out after Capporetto. Maybe the Entente could hold them, but at what cost?
France, had OTL the problems with its army, solved in part because USA troops would arrive in time. Here no such boost to morale has happend / will happen. So they will be weaker then OTL.
And lst but not least Britian will have to sell its beggers bowl... so they may find their imports, and those of the whole Entente, cut to some degree.
So not only the CP was crumbeling but here the Entente will also face compunding hardships that can very well shake then appart.