It would have, but it is too late for that. Nothing about them is close to mainstream, nor could it be at this point.
The WTS is a an end-times religion, they made that bed a long time ago. For an end-times theology to work, certain things need to be in place. All of those things center around high control, (including the end-times theology itself). The control is needed because people will not remain believers in that type of theology very long once they experience a sufficient level of success in life. End-times theology is about hopelessness.
Successful JWs stay in because they have acclimated to the social environment, and the cost of leaving is too high. The control mechanisms are what keep that cost high, since loss of one's social environment in the form of lost friends and family is very expensive, no matter how successful a JW is. Take away the control, (which includes the social price of leaving), and most successful JWs would walk overnight.
d4g