If the concern is that someone is paying less in tax off $250,000 in capital gains when they realize their wealth than someone who is paid a wage of $250,000, the policy prescription (with which I agree), is to tax $250,000 capital gains like income, I.e. at the top marginal tax rate.
What happens if I liquidate $50,000 at a time over the course of 5 years, and continue to pay a net effective tax of around ~20%, which is what the long term capital gains tax is, today?