Depends on the nature of the war, if we propose OTL, but if France collapses ala 1940 (in 1914) and then the Germans trash the Russians (and Italy/Romania/US don't join), yeah I would think so.
Yes. The earlier, the more likely it's seen as 'inevitable' if for example we are positing OTL, but the German army gets expanded instead of the last Naval law and this extra force concentration smashes the French lines (Eg, SPGs/Tanks/APCs/Trucks) in a western Tannenberg, it would to me be seen as inevitable that the qualitatively and quantitively superior Heer would win in France, and consequently rupture the blockade, keep Italy from joining (at least on the Entente side) and then be able to turn their full power to deal with Russia - Given that it is then very unlikely that GB could do anything that's materially important for the central struggle, with the possible exception of the Dardanelles, but it seems likely that there would be sufficient excess German combat power to render the Bosporus unusable even if that succeeded, and consequently I don't think anyone would think it would materially alter the outcome of the Eastern front.
Whereas if we are talking about a 1918 PoD (with or without the US) then clearly it wouldn't be seen as inevitable.