Hm. Going by all the posts in this thread, and having just now read thru the entire lot, I am more confused than ever.
Every camera I've ever used long-term in my long life (two longs = a long long, ha!!) has been, in one way or another, my chosen lifetime camera - at the time.
So I'm now considering whether to renominate my Rolleiflex, my Nikkormats, my Contax Gs, my Leica iif, or my collection of Nikons - D700 D800, Z5, Z6, oh, and the D90 I bought new 17 years ago which we still use (with the original kit lens, no less) for our at home cat casual snaps - as my 'For Life' camera.
Never mind my recurring thought of why should be have only ONE camera as the bestest and mostest? Let's be democratic about this, could we bend, flex, loosen, stretch or whatever the rules here a little to provide a multiple options escape clause.
No matter. I will again remind myself that like most things in life, it's all a game, and I enjoy playing it.
Another thought. Whatever the outcome of all this, me being me, I will now opt to have the entire lot of my gear buried with me...