Interesting idea. The WTBS had a very workable (and I'm sure profitable) business model for many years. Their volunteer "labor" bought 12 million magazines four times a month. In theory, the R&F got their money back when they sold the magazines at the door, but the WTBS didn't care about that because they'd been paid already.
This thing hummed along nicely until the supreme court decided that the income was taxable in a case involving Jimmy Swaggart. They tried going to the donation arrangement, but obviously that has not worked. They are clearly trying to launch a new business model, involving owning the real estate and collecting "pledges" to recover the income stream. The pledge arrangment is significant when dealing with banks (my granddaughter's school is going through this right now trying to fund a new building). Banks look at donations as an income stream that can dry up any time. A pledge is regarded by the banks as a more reliable source of money, as its evidenced by a piece of paper.
As they implement this new model I would not be suprised to see some major changes over time. Field service will always exist, but the emphasis may be reduced. In their shoes, I would relax the prohibition on higher education, particulary I would emphasize two year degrees, internships, and union programs, as they are faster, cheaper and don't encourage as much thinking as a full university. I would start taking about tithes as the membership moves into higher paying jobs. This will all take time, but eventually the religion could morph into something more like Mormons or Seventh Day Adventists, a bit querky, but a more mainstream.