The gap in belief between liberal and conservative Christianity will widen. Megachurches, where one can tap into everything from Bible study to support groups, will become more common. Other religions may follow suit. At the other end of the scale, small congregations will form clusters and hire a single leader. It sounds dead, old-fashioned, archaic.
Spirituality is a safer word.
If you can say you are spiritual, you don't have to make a commitment. For a lot of people it's a way out. The ancient commandment to help one's neighbor can become an afterthought. Combine that with faddism and good old American individualism, and we see a 'religion' so privatized that it has little impact on society at large. Christianity remains highly fragmented.