Offices or galleries. I imagine a fair number of businesses would be willing to pay for Guggenheim approved art, and though making it accessible to the public may be difficult they could allow scheduled viewings.
There's some truth to helping generate repeat business, but even with a 100% yearly rotation rate that's a 17 year cycle to see everything without counting new additions. I doubt people are going to lose interest because two years prior to the new showing they could have traveled to Oklahoma City to view it.