If a positive can be extracted from Boston celebrating another professional sports championship (barf!), it’s that it demonstrates 180-degree turnarounds are possible.

Even so, Indiana Pacers fans would be wise to tread cautiously with their enthusiasm for the 2008-09 season.

“Yeah, but the Celtics ...”

Stop with the “yeah, buts.” The Celtics, a bottom-feeding winner of 24 games the previous season, caught lightning in a thimble straying from the traditional blueprint of building through the draft.

Sometimes impatience has its rewards. This was one of those times.

Bringing in Kevin Garnett, 32, and Ray Allen, 33, meant Boston’s window of opportunity was incredibly small, but the franchise took full advantage and should be applauded.

“Yeah, but the Celtics ...”

Quit it. No matter how many roster moves the Pacers make during the offseason, a future first-ballot Hall of Famer like Garnett isn’t going to be part of the equation.

Therefore, the Pacers’ progression chart the next few seasons needs to read as such: better, good, very good.

Oh, and in case you didn’t receive the memo, the Pacers are now Danny Granger’s team, with oft-injured Jermaine O’Neal traded to Toronto.

Not Mike Dunleavy’s team or Jeff Foster’s team. Certainly not Jamaal Tinsley’s team.

Danny Granger’s.

This would seem like a lot of weight to lower onto the slender shoulders of a 25-year-old about to enter his fourth year in the NBA, but Granger possesses All-Star-caliber game, demeanor and professionalism.

Really, when was the last time we said that about anyone associated with the (black-and) blue-and-gold?

Barring any more moves by team president Larry Bird — and we hear some could be in the works — Indiana is in a position to start T.J. Ford at the point, Granger at small forward, Dunleavy at the ‘3’, 7-foot Rasho Nesterovic in the post and one of the brothers Rush, Kareem or 6-6 rookie Brandon, at the ‘2’.