Or is it perhaps a bit premature, with the "Process" - whatever you think of it - lagging a little behind Boston's rebuild? Does that element really matter? Is there another team out there Boston will be clashing with all the harder? Two other teams entirely with a more heated rivalry?
Personally, even though the 76ers will likely be a far superior team than the Los Angeles Lakers, I think a LeBron James-led Lakers-Cs series will be more interesting, and potentially the Milwaukee Bucks and Toronto Raptors could both prove to be much more intense series, even if official "rivalry" status hasn't been established.
Let's not forget that the Washington Wizards still think they have one with Boston, and plenty of other teams have some serious axes to grind, too, even if not with the Celts. The Cleveland Cavaliers probably would like to lay a good whupping on the Lake Show, and a Houston Rockets-Golden State Warriors series or a San Antonio Spurs-Raptors series ought to be pretty interesting if not a rivalry, per se.
What other simmering opponents are there out there, waiting to erupt into a full-fledged (or revived) rivalry? Watch the video above, and let us know your thoughts in the comments below.