No doubt IT has a heart as big as all outdoors and developed beyond anyone's expectations, but this is a business, it's about winning an NBA title.
It's pretty unlikely the Celts are winning a title anytime soon whether or not they make that trade.
So the question is, if all it ends up doing is raising the ceiling in any given season for the next 3-5 years by 5 wins or so, was it worth completely wiping out the core of a likable, successful team?
If this hip injury is as bad as it sounds like it could be and Isaiah is never the same, while Kyrie continues to be a perennial All-Star and compete for All-NBA honors for the next half decade, it's a no-brainer, great trade.
If, on the other hand, Isaiah returns to his 25-30 ppg form and plays at or near that level for another 3-5 years, while the Celts fail to take a leap beyond the level they reached last year, it's a fair question whether the trade was worth it.