I think they've reached the top of their hill; they've peaked out.
If they continue selling the same product, then I agree with you. Right now all their marketing gimmicks have simply been efforts to put lipstick on a pig, selling the same burrito but putting it in a shinier tin-foil wrapping.
An ordinary company would recognize the need to make wholesale changes to the product, but there's a two-fold problem here. One, aversion to change runs deep in the religion's culture. They have the truth; why change it? Conformity is required throughout all of its ranks. Two, the men who lead the group spent their adult lives and made their way up through a system designed to select the most pliant and sycophantic among them. Anyone with even a minimal ability to re-imagine the religion's doctrine would have been culled from the ranks long before they ever became candidates for GB membership.
In my mind that leaves two possibilities: they continue a slow, gradual fade into further irrelevance or a younger charismatic person (or a group of persons) grabs control of the religion and takes it in a different direction. The second possibility becomes more realistic the more the religion stagnates.