Well my personal opinion is that whatever comes out of this will probably be a mess as well. Too many players, too many on equal footing, too many factors. Ideally the Western nations will work together for their common unified interest.
But ultimately I always had a bad vibe about a potential future for mankind, one I would be disgusted with now but which sadly is likely to happen IMO:
1- First and foremost, an economic crisis of major proportions leads to the bankrupcy of the states. The world governments fail to act together due to self-interests and distrust. For the sake of getting the economy started again, deregulation occurs after short-lived attempts at regulation simply caused the economical crisis to lengthen. As countries face complete economical collapse, other nations see once-in-a-lifetime opportunities to seize at a time where their survival is on the line.
2- Due to the world wide crisis which led to massive unemployment, certain countries significantly ease various restrictions, even at the cost of security, to create employment and incite business to resume.
3- The above leads to global competition for practically any job, first among the countries that started to eliminate regulations and restrictions, then throughout the world as the whole world sees such action as the only immediate alternative. Visa restrictions are significantly reduced, tax codes are completely revamped across the world at the demand of select nations that kick-started the restriction-easing movement. The way people are taxed is no longer directed by nations themselves but by a global agreement, with a few exceptions.
4- People will do anything for a job, and that means competing with people from all over the world for any job as visa restrictions are lessened to accommodate for greater mobility of workforce. Chinese and Indian graduates, among others, are in such large numbers that no sector would give us Westerners an advantage in securing a job anymore.
5- This competition results in lower salaries due to the sheer number of applicants, and also due to lowered expectations from a workforce that has never had access to ownership or high salaries nor decent levels of comfort.
6- Lower salaries results in a widening gap between middle and rich class. The defining factor between one of the middle class and high class is, for the most part, ownership. The defining factor between the middle class and lower class becomes, for the most part, mobility.
7- All of the above leads to higher crime rates and heightened pollution levels, accepted as short-term side-effects of the new self-emerging system; it is a time of survival not of betterment. Terrorism and anarchy gains grounds and leads to a reform of security forces in conjunction with the economic world-wide reform that takes place; eased mobility of workforce which becomes synonymous with eased mobility of criminals brings about a more globalized law enforcement body which oversees both criminal activity and workforce mobility.
8- Warfare itself subsides as borders slowly lose their significances and as mobility of workforce and hence globalization of the economy leads to lessened incentives in declaring war lest one was to cause another economic crisis as a result. Insurgencies on the other hand are now common throughout the world, less organized but with common themes recurring throughout.
That has always been my worst case scenario.
The other scenario (no scenario is likely to be "good") would be more international agreements related to regulations. But that would be very difficult to achieve IMO.