The World sees the same things we see. He's always lacked good judgment, he's physically frail, and he's mentally done. His son is under a serious FBI investigation so the news could get even worse for him. Thus, there is no one person really in charge. He's being propped up and his appointees/dep't heads are running their own little shows in their own little power fiefdoms, just like Milley called China behind Trump's back. Further, Biden's No.2 is a dismal human being with an equal lack of judgment (supporting the horrific Afghan withdrawal, not dealing with the border) so there's no bench to turn to.
We therefore have a power vacuum in the World with us failing to lead. Here's a list of things that could easily happen as a result:
1. China moves closer to taking Taiwan.
2. Russia claims more Ukranian territory.
3. A Russia-Nigeria-China-Iran-Venezuelan cabal replaces the petrodollar and they dump US currency.
4. Iran develops the bomb (unless Israel stops them).
People can shoot down these potential developments and that's fine, but there's no doubt that the World is, and will continue to grow to be, a more dangerous place under the Biden Admin.