This comes from the NIC, which is the coordinating body of the CIA and the other US intelligence services.
This is not a leftist whacko theory but the official analysis of the leaders of the US intelligence communtiy.
Don't shoot the messenger
On the other hand, Europe won't be in too great a shape either.
They predict India and China, possibly Russia (if they can fix everything that needs fixing) as equal players, with Iran, Turkey and others as new regional powers.