Wow! That sure is a lot to absorb! I am most surprised at the East Rock move, although it had been rumored. Sounds like more travel for them, considering that the Bull Run stretches all the way to Fairfax, but I guess they know what they are getting into. I would have assumed that at some point, their change would have been to move up to the Valley, assuming that their enrollment is on the way up.
I understand Waynesboro's position, although it will never seem normal to have Lee (or whatever name it will have in the future) and the Giants in different districts. They are natural rivals.
But the biggest adjustment will be for the Shenandoah to lose four of its teams and drop from a nine-team league to only six teams. If you do the math, that will mean the AD's will have to scramble around to find 5 non-district football games and as many as 12 non-district basketball games.
I am sure each school's fans will have their own ideas as to who they would like to see their team play, so for my school, Riverheads, I would hope that they would keep it as local and traditional as possible. 
For example, I would suggest bringing back the Waynesboro series, re-establishing the Parry McCluer rivalry, perhaps renewing  acquaintances with James River and/or Covington, and last but not least, I have never understood why the Gladiators don't play Rockbridge, considering it is only 25 miles down the road.
On the other hand, I will see nothing to be gained by continuing to play Bath or Nelson. RHS does travel extremely well so if they do have to keep Central Woodstock on the schedule, or experiment as we have done before (Clarke County, Radford, William Monroe) we will be there!
I understand the need to bring some teams from 1-A into 1-B, but that will create some traveling nightmares.  I do hope that will lead to 1-B having an eight-team football playoff, thereby doing away with the first-round bye. Riverheads has received it several times, even though we hated the idea, and other schools complained, thinking it gave us an unfair advantage. So I will be glad to see that nipped in the bud if it happens.