The simplest and yet perhaps most profound thing of all: Brotherhood 2.0 did exactly what it was supposed to do. Two brothers who talked together maybe once or twice a year before it all began now talk on the phone practically every day - five years after the project ended.
On the last day of Brotherhood 2.0 (Dec 31, 2007), the two brothers got together and a sang a duet called "Goodbye Brotherhood 2.0" to commemorate all of the memories that they've shared over the year. As sad as it is, it is absolutely adorable.
Hank's video on sexual abuse and consent, based on debunking old views of the concept and creating a general You Are Not Alone atmosphere that rubbed off on a lot of fans in the comments. John's next video even ended with him saying that this video made him proud to be Hank's brother.