If we are going to have arbitrary procing systems that doesn't make sense except it keeps us busy, you might as well make SC > MB mandatory again.
Make the next expansion require SC or MB to be used to defeat more difficult mobs. Just let them stay at 0% until they are hit by one or the other. If you are going to take the time to forcibly educate people how not to play together properly as a group in aby, you really should make sure everyone knows how to play together properly when it actually matters.
I'm sure I'll get tons of conflicting views on this about how people are too lazy to actually do something in sync with another person, but too bad. Get Skype, get Vent and be sociable. Write decent Macros if you don't voice chat. I'm pretty tired of everyone being too lazy to do SC > MB because it's not required. So make it required again.
UPDATE: if you are going to TL;DR the entire rest of the discussion and only comment on the OP, then realize we moved on to how Party Tactics and SC>MB could be improved to make the game more interesting.