"Just as the larger G-20 - rather than G-7/8 - was energized to deal with the 2008 financial crisis, we expect that other institutions will be updated¿most probably also in response to crises," the report said.
Meanwhile, the economies of Europe, Japan, and Russia are likely to continue their slow relative declines, it said.
According to the report, by 2030, no country - whether the US, China, or any other large country - will be a hegemonic power.
"Enabled by communications technologies, power almost certainly will shift more toward multifaceted and amorphous networks composed of state and non-state actors that will form to influence global policies on various issues," it notes.
The NIC report believes that in the world of 2030 ¿ a world in which the growing global population will have reached somewhere close to 8.3 billion people (up from 7.1 billion in 2012) - four demographic trends will fundamentally shape, although not necessarily determine, most countries' economic and political conditions and relations among states.
These trends are: aging both for the West and increasingly most developing states; a still significant but shrinking number of youthful societies and countries; migration, which will increasingly be a cross-border issue; and growing urbaniSation, which will spur economic growth but place new strains on food and water resources.
Among the US Census Bureau's projections for South Asia, only Afghanistan is projected to remain youthful by 2030.
However, the aging that will occur among the large and growing populations in nearby Pakistan and India probably will mask youthful ethnic and regional populations that could remain a security concern, it said.
"In India, where the southern states and large cities have attained low fertility, youthfulness - which can contribute to instability in the absence of employment outlets - is likely to erode more slowly in the central northern states of Uttar Pradesh and Bihar," the NIC report said.