They imagine they can continue to do so in the future. However, the loss of volunteers in the non-Mormon 70% of the organization will eventually give the entirity of the residual organization a Mormon flavor. I'd suppose that will give them total access to the 1/2 billion dollar asset base. No doubt they will like that.
I'd like it a lot, too, if it meant keeping those assets away from monstrously evil spawn like Lambda Legal, GLAAD, and PFLAG. Think Kevin Jennings and Evan Wolfson and an army of leather- and mud-men, armed with half-a-billion dollars.