Personally, as a performer, if G7 were to break away, I would simply not audition for them. And I know several others who feel the same way.
Which brings me to: Will the G7 corps talent go down if students wish to stay in DCI? If others feel as I do, and if I were of the 2000 auditioning for a corps, I would take my talent to Drum Corps.
Which also means, more corps will have that level of competition, because the students will be going to (as of now), not top 7 corps, therefore you will see better products and talent from all around.
Which means, more people will go to see the good corps, not the G7.
And eventually, maybe G7 would beg to come back.
Maybe we would see a growth in the lower tier corps, and a growth in Dci.
Or Maybe it's the opposite, but I would simply boycott the G7.