False religions would have to build their own premises instead of just buying them off the JWs when they need to get the money out.
Witnesses sell, Elim buys
There would inevitably be more child abusers in a variety of other religions and cults looking for vulnerable victims.
JW_Rogue - "How would the world be different if there were no JWs?"
Saturday mornings would be just a tad quieter.