If you're arguing for longer XC races for women at the NCAA level (the pro/intl changes are irrelevant because we are talking about the best of the best, not 18 year old kids at Local Private College X), you clearly have never seen the daily struggle to field competitive and deep women's XC rosters at the CURRENT distance.
Sure, Oregon and Colorado would be fine because they are getting athletes who can do that work to be prepared. But the reality is that most of the D1 women's XC programs will wither and fail at 8k or 10k. There just simply aren't enough women who can train appropriately for that distance.
And if you're getting all upset because I'm saying some women can't do the same things men can you just don't understand the reality of what most women runners at a college age and level can handle. I am a D1 coach at one of these small schools. My best male runs 24:35 and worst runs 28:00 (3:25 diff); my best girl runs 21:35 and worst runs 28:30 (6:55 diff) (and plenty are over 26:30). We invest the same scholarship into both genders, about 4+ scholarships into each gender. The rosters are similar in size. Many of my women can't handle 6k, hence the huge time range.
Again, moving women up to 8k or 10k would drastically reduce participation and viability of women's XC in the NCAA. Yes, you could say it limits the ability for more men to compete in XC at their current distance but the reality is simply that there are plenty of men to field a majority of D1 teams. I have men running 80-100mpw by the handful every year, 1500m runners up to 10k runners, and my highest volume woman has been 70ish mpw (EVEN our 10km runners!).