If I was the pastor of a little, dying church, I think I know what I'd try. I think I'd have about 12 15-minute services each Sunday morning, each separated by five minutes of coming-and-going time.
It's a shame, but people these days are so busy that I wonder if even an hour each Sunday seems like too big a committment to them. I wonder if it would be attractive for some people to be able to drop in just about any time throughout the morning, or even throughout the day, and maybe even on Saturdays, too.
People who don't normally go to church might stop by on their way to play golf, or on their way to the beach, or after Sunday brunch at the local restaurant, or whatever.
And as for content, I actually think a lot can be packed into 15 minutes. A couple good songs, a prayer and a short sermon. Shortening things often makes them better, more pointed.
I know! I know! It seems this encourages a rather casual, uncommitted attitude toward gathering together. It may, but I'd rather have 15 minutes of their time than none of their time, and I'm not aware that the Bible says exactly how long a church meeting has to be. In any case, I envision this as an introduction, and that some people would step up from this into a deeper and more active level of commitment, perhaps by getting involved in a Bible study group.
Just an idea.
