I've discussed all of this over and over during the last two years, so I'll keep this short, but:
1. As Midlo Dad says, everyone knew there were alignment problems. But they could have been fixed with some modest changes to the existing set-up.
2. The VHSL, however, wanted more championship events. The smaller schools also liked that, because it gave them better chances for championships. The AAA schools voted against this plan, but not in numbers great enough to offset the overwhelming small school support.
3. A state with a population of 8+ million people does not need six state champions in any sport other than football (and even that is debatable).
4. Because the VHSL is only really concerned about the championship events, they will be very "hands-off" on implementing this plan (see also the out-of-season practice rules). So, you're going to see all sorts of varying decisions on how to implement this from area to area and sport to sport.
5. This will be a mess, especially in some of the minor sports.