I agree it is a driver of significant change.
My take on it is slightly different. Up until recently, Watchtower had an advantage over other fundamentalist Christians in that it had a highly successful business model based on its publishing business. Technology has destroyed that business, and now Watchtower now depends solely on donations from its own adherents.
As a result, Watchtower is becoming just another fundamentalist religion, competing in a crowded field, where much of the competition have business models that still work (eg SDA with its food businesses and retirement homes, Catholics with their schools, hospitals, etc). Worse, Watchtower is at a disadvantage, because it is now managed by a committee of morons who can't make changes without a 2/3 majority, believe their own b.s., and seem to be just doubling down on what worked in the past.
Will they become more accepting of outside literature? I can't see how they can survive as a high control group if they do. But not doing so also disadvantages them against the competition. It will be interesting to see how it plays out.