I have been following this thread and am a little perplexed, or maybe saddened.
Music is an important part of worship. It reaches the soul in ways that can compliment the other aspects of worship.
But to debate whether one style of music is better misses the point.
For myself, I am more comfortable with a traditional organ & old time hymns that remind me of the first church I attended after accepting Christ, and even farther back.
But that is me. And, the most important point of being part of a congregation is not primarily my comfort. It is the question of whether I can be nourished there, and whether I can help nourish those around.
A couple of miles from my home there is a little Primitive Baptist Church.
For those who may not know, the Primitive Baptist Church is a doctrinal y conservative denomination marked by informally trained leadership (no theological scholars and seminaries), Families worship together. Training in Christianity is the the families responsibility (no Sunday school). Foot washing as a sacrament to teach humility and service to others.
They also do not have instrumental accompaniment to their singing. Just voices.
There are many other churches near-by. There are many approaches to the 'kind' of service presented, most obviously but not exclusively in music. Some with a strongly folk-rock approach. Some following one of the more traditional approaches.
A church where I was blessed before I moved to my current home (that I am in the process of selling) held a contemporary service early followed by a traditional service. While one set was in the sanctuary at service, the other was having Sunday school. There was about 45 minutes between the end of the early service and the start of the later service where coffee and donuts were available, and both sets mingled and fellow shipped together.
Now there are other churches I have visited where I felt that the music was great, but the time spent was pointless.
If the point of the selection of music style (and preaching style for that matter) is to minister to some segment of the people by getting them to attend, that is fine, but if once people are in the pews they are not given something of Christ to take away that they did not have when they came in, what is the point?
This is getting a little long. I'll have more to say regarding the fall of church attendance apart from the choice of music styles later (if I can get my self disciplined).