Coop has a pretty good post up about church in an era without cheap oil and natural gas. His thoughts echo the very same concerns that I have. Our church buildings are big empty spaces for most of the week and some people drive a long way to suburban church campuses. As the oil and natural gas become more scarce this way of doing things will end. I think the church will shift towards smaller community churches, simple churches and anything that will meet in a multipurpose building. You may see more congregations share a building and stagger their services.
The college I work for relies heavily on long distance ministry whether it be a music or drama team traveling to churches or our annual short-term missions trips. I can’t see this continuing in the long term. While it has become quite fashionable for bible colleges and youth groups to attract youth with short term missions it will simply become too expensive to do so. I personally think we should shift to more in depth local mission experiences. You will lose the benefit of the in depth cross cultural experience but it offers more opportunity and flexibility.
National conferences are another thing that will slowly pass by the wayside. More and more people won’t be able to fly across the country regardless of the quality of the content.