I've queried the large store reseller and it appears that they do not have clue as to when they will receive their shipment. And then there's the issue of how many are in line for whatever number that they are allocated.Congratulations on ordering and great points you make.
Indeed, life is short and unpredictable, why not enjoy it while you can.
I am using Fuji, Sony, Olympus, and now to a much lesser degree Nikon and Leica gear, mostly lenses of the latter two. Some of those FF lenses can even be adapted to the Fuji GFX cameras, showing only a tad of vignetting.
I am curious how long it will take for you to receive the GFX100. Please let us know. Good luck.