I think we should resist the urge to take an outsider's perspective on change. We can all easily imagine ourselves as business consultants hired by the Watchtower to come up with a list of initiatives to improve morale and promote growth and retention.
Let's not forget that the men on the GB won a decades-long competition designed to reward the most loyal company men and status quo seekers. They've been selected for their aversion to change. Had they demonstrated the inclination to think creatively or shown independent thinking, they would have been weeded out at the CO or ambitious young Bethelite level.
Edited to add:
You also have the 2/3 supermajority problem. Even if you were successful in convincing a change-resistant GB member, you'd have to get 2/3 of them to agree. That's a tall order.
An exceedingly slow death by bureaucratic inertia remains the most likely outcome, in my opinion.