What part of that endowment dedicated to basketball? What is the higher priority for unrestricted spending from the endowment -- financial aid or basketball?
Ignoring the revenue question won't make it go away. Programs that spend more than ND also earn more than ND. Some of this is chicken-and-egg; a stronger program would generate the revenue needed to make the program affordable. But that alone isn't enough to level the playing field with, say, Marquette.
A big time benefactor for basketball wouldn't hurt. In the meanwhile it's hard to see how significant change in MBB will happen without a serious look at revenues.