You’re not “keeping it intact to prevent harm.” You’re keeping it intact because you benefit from it.
The US led system isn’t something you stabilize and then dismantle later. It only exists through massive violence. Every extra year you preserve it is more sanctions, more bombs, more dead people.
And “after Trump” is always the line. It was "after Reagan", “after Bush,” then “after Trump,” then it will be “after the next Republican.” There is always a new emergency to justify doing nothing to even attempt to slow the immisiration machine.