Kind of my point: I never heard of a bitcoin early adopter who started out saying "sucks for payment, but I'll happily bet on it becoming a self-sustaining rally", but many who initially expected a currency seem to have unknowingly pivoted to the nice feeling of owning ever increasing virtual riches (that will only grow bigger and bigger as long as almost everybody sticks to the program of not touching that wealth, "just one more turn"), with no payment function at all.
And it hasn't displaced anything, has it? I still don't expect it to do anything of the sort.