I'll be honest I've only read half of the post here...but have been reading the forums about this very same subject since SE announced 2.0...and my imput...
REROLL EVERYTHING...fresh start in a fresh new world...anything we have done up to 2.0 should be chronicled...some sort of search function for our characters so we can read about our past adventures...maybe even have something like the goblins in XI who allowed you to re-view past events...