As the FT points out:
'In a matter of days [Trump] has undone trusted global relationships that have taken decades to build. The task of reviving such trust, even after Trump is no longer in office, will be gargantuan — if it is possible at all'.
What will happen when a global hegemon's 'leadership' crumbles. If we are entering an interregnum, will a new hegemon emerge or multipolarity (a series of regional blocs) will become the norm.
As you will know, I think the latter!