Problem with all this is that GB is not drinking lead paint and so will not just do as it did OTL because it did it OTL. If Germany and Russia ally then GB is more likely to stay neutral, it knows its got the weakest army and blockade will not work. Similarly A-H is not committing suicide by taking on Germany , Serbia , Bulgaria ( probably ) and Russia. France can do numbers and so just seethes. Belgium/Holland are trying very hard to look small and inconspicuous and be ignored.
WW1 can only really happen if there are two blocks that think they need to fight and can win. A Germany that has Russia as an ally has no need to fight, France/Britain have no need to give A-H a blank check so if A-H feels suicidal, they just go no thanks.