So a large corporation which owns multiple businesses manages all of these businesses or sets policies which they comply with and manage within?
We won't have a one world government, but perhaps a board (think UN) which sets order, countries follow this order while still having governments manage the country they govern.
We can already see it happening, open trade and the dependencies we've created on this creates a scenario where countries have to comply with the general approach or get shut out of trade, think sanctions etc if you have to see a current example.
Also one world currency is enough to enforce countries to comply to a set way, play part or get shut out of global trade.
You have to question why the USA allowed open trade and sent most of it's workforce offshore, you think they couldn't predict the impact that would have on it's middle class people?
bit by bit we slowly move towards a global village...we would all scream if it happened overnight.