It's $250 billion less that goes to the ultrarich, so that they can't purchase another $250 billion of assets.
That's not really how that works. Almost all of that money is tied up in operating businesses. Most very rich people mostly hold investments in stock - and generally at large companies. That's debt, not an asset I think the way you're thinking of. Overall, taking that money out of market holdings reduces the value of those holdings, for everyone else as well. You really end up lowering the retirement savings value of everyone who has a retirement plan by some amount.