They already yielded. Cut 3,000 staff, cut 15% budget, speed up troop withdrawal from Congo. What more yielding do people want.
There is no guarantee of anything from yielding. The US owes $4 billion and there's zero incentive to actually pay. Withholding is the leverage. Once you pay, you're out. Essential game theory concepts. Both Washington and Beijing figured it out. That is why China is still $455 million in debt and acts as if it's still protecting multilateralism. Bit rich.
In the 80s, Reagan did the same thing literally! Kassebaum-Solomon Amendment, pulled out of UNESCO, withheld dues until the UN restructured. What IS different this time: Trump pulled the US out of 31 UN bodies in January alone. UNFCCC, UN Women, UNFPA.
Meanwhile WFP is operating on half its needed budget. Reducing food rations in West Africa as we discuss whether the institution is "bloated. Real people, real hunger and we're talking about efficiency.
The UN won't formally die. There's no mechanism for that. But it can turn into a complete hollow and by all means it is going. A paper organisation that does not do anything is worse than a falling organisation. At least collapse forces you to build something new.
Will we lose the UN? Nah. We will simply have it around as furniture.
I'll argue with the last argument

Argument number 1: who and for what money will maintain this HUGE, formalized, useless but mega-corrupt organization? There are no fools to just throw money away so that they can continue to live without doing the slightest good.
Argument number 2: About usefulness. Somebody probably thinks there is?!

That's a fallacy. I used to think they were saving from hunger, building schools, hospitals.... Yes, in fact, they do. But that's the picture behind the wildest plundering of money and corruption schemes around the world.
For every 1 dollar of real aid, 9 goes into the pockets of UN officials and local officials involved in “aid” schemes. It sounds disgusting, but it's a fact.