Well, they could dump the money pits and sell them to the Muslims, who might pay a premium price for the opportunity to remake them as mosques and declare them the 18th, 19th, 2oth,... most holy sites in Islam.
The Church isn’t in the buildings, after all.
I’m afraid that Pope Benedict was correct when he wrote that the Church would undergo a great contraction. Hopefully, this process will lead to a Church that is filled with the Holy Spirit.