I think the streak is a good thing. I think things like that boost team morale and are can be appreciated by fans over the long term.
Rondo's assist streak is something that every guy on the roster will take away with them when they leave the game. Especially with an assist streak, it's a team accomplishment.
And the idea that Rondo is being purposely unselfish to boost his stats seems off. This is the most aggressive he's ever been! This is the first year where he's come out the gate firing jumpers with confidence and getting the ball in his hands on every significant possession.
I'm confident that the guys on our roster are about winning first and foremost. Rondo seems to be among the more obsessed with winning so I've generally gone to bat for him on here (when I'm serious) and never questioned his desire.