If you can’t answer it you can’t move forward with the plan. It might be an interesting intellectual discussion, but it’s pointless beyond the cerebral exercise because it’s impossible to implement. “It’s impossible to implement” simply trumps all other arguments.
> but that doesn't mean there's never going to be a number that we can agree upon
There is no way to get to an agreement on a specific amount because you theoretically apply the same “pro” arguments to wealth limitation to a billion dollars to $100k or even to $14,001. The alternative is a prohibition against any individual wealth accumulation. I’m absolutely not for that, so you and I will never agree on a number, because there isn’t a number where I would say “that is too much”. I am dead set against any wealth limitation.