I think Di2 is about to become much more common. Felt has it on a bike that retails for $5900, and actually can be had for $5400.
Pro Bike Kit has a full Di2 group now for $2400.
It's about to hit a price point where the premium over 7900, and Super Record will not be that large.
__________________
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.