WHY SMALL CHURCHES STRUGGLE
According to George Barna's most recent release:

Small churches have a higher proportion of downscale adults, who tend to be less aggressive, less inclined to assume leadership, and less oriented toward institutional growth.

Larger churches attract a greater proportion of conservative adults, who tend to prefer knowing acceptable boundaries and working within them. Church-going conservatives substantially outnumber church-going liberals.

Baby Busters are more likely to attend a small church than a large church. They have energy but they are less interested in numerical growth, have less leadership experience and fewer resources to invest in a church.

Lots more fodder for thinking about the role of size in the effectiveness of the church's mission... Link