Hi,
with germany doing this in 1916 france and russia will attack germany and try to destroy it.
germany has no ally and has big troubles... maybe germany can beat france, but russia will be a problem.
great britain will find a way to join th efight, so germay is doomed, cause this time they fight alone.
so no - for germany this means that ww1 will happen 1916... maybe - big if - germany develop gas grenades as a secret weapon, so they can gas the french and russian they could beat em so hard, that they can break one of the both... but only in this scenario...
the chances are
10% germany beat both, uk stay neutral (cause of a "wonderweapon like gas")
1% germany beat both, uk support germany
69% russia and france beat germans
10% germany beat france but has to make peace with russia
10% germany hold/beat russia, russia break cause of revolution, draw with france (similar to brestlitovsk in the east)
generally:
uk joins germany 1%
uk stay neutral 10%
uk joins france and russia 89%