Current Colorado cyclocross field sizes:
Cat 5: ~50
Cat 4: ~40
Cat 3: ~20
I think this change will shift the distribution to more of a bell curve with the Cat 3 and Cat 4 field sizes becoming about equal and the cat 5 field sizes decreasing slightly. I don’t think it will impact the Pro/Cat1/Cat2 that much since the majority of points earners in the Cat 3 fields are juniors (who don’t have to upgrade beyond Cat3).
It will force more Masters Cat3 into pro field, which will probably flatten out the Masters categories, where previously Cat3 Master was the largest.