This is not a good thing for men's sports at all if this interpretation becomes law within the ncaa. If you can't duplicate women's track/xc athletes many more men's programs will be cut.
A typical men's program may have 15(xc), 40(indoor), 40(outdoor) athletes. Total participation= 95
A typical women's program may have 30(xc), 50(indoor), 50(outdoor) athletes. Total participation= 130
In this situation, with duplication and assuming all xc runners run track, the school has +35women. Were duplication disallowed, this school would only have +10women.
Now, it's tough to say exactly what would have to be done because the total participation (ie, duplicated count) for sports must reflect the general student population. But let's assume they just need to keep the same +35women figure.
There are a few ways to fix this problem. They could adjust the track numbers to fix the problem by reducing the men's roster to 15, essentially making it a "one event" program (all sprints or all distance/xc). Or, they could RAISE the number of women to 75. They could cut other men's sports by 25, or raise another women's sport by 25.
In these tough financial times, I guarantee athletic departments would cut 25 men before adding 25 women. Many of the larger athletic departments could handle this change, but even for them it would be a hassle to reorganize their roster sizes.