Honestly, I don't expect the world to end nearly as much as I expect western society to undergo some serious changes; what forces these changes will not be external forces but will instead be caused by a collapse of the internal structure of society.
I'm not (by most standards) an ultra conservative, and the reason I feel this way is that there are groups of people who are attempting to engineer a perfect society by removing the social structures they dislike and replacing them with more 'ideal' structures. Lots of effort goes into 'marketing' these changes as either you're for the change or you're an evil human being with no heart that should die a horrible death.
Personally, I'm not worried about any particular change as much as I am about the actions that occur after the change has taken place. The groups who worked for the change immediately move on to their next cause, few people ever track the consequences of the change, and any negative consequence that is discovered becomes politically incorrect for anyone to mention.
I expect that (over the next century) you're going to see grass-roots 'Puritan' movements gain steem in most western societies which in turn will clash politically with the existing 'Social Engineering' movements. In some countries this may even degrade to civil war or a collapse in government.
