Well, let's see how they do next year. My fear is that the Celtics will be "one shot wonders" like Miami and Detroit.
Detroit is a good example of a team whose stars all seemed to get old at the same time. Detroit has players like Maxiel, Stuckey and Amir Johnson waiting in the wings, but Boston doesn't really have a bench full of young developing players like that. Many of their young players went to MN or Seattle last year.
Well, a few things to keep in mind.
1) Detroit wasn't the best team in basketball when the won in 2004. If they play that series 10 times, LA probably wins 9 of them. I'd call that a fluke as much as you can a 7 games series. They're probably the worst team to win a title in the past 25-30 years.
2) Miami got hit with the injury bug big time. Shaq was older than any of the big three, and much bigger. It was inevitable his body was going to break down. He was fading even as they won the title. None of that appears to be the case with our Big Three.
3) Allen's value shouldn't decrease much even if his play does. If anything, he might be worth more after next season than he is now given his expiring the contract the year after. So, there's no harm in holding onto him.
4) Whether you're worried or not, that package above doesn't make them a better team. I know I've harped on this, but remember, Boston is now a destination. Who knows what we can get in the way of players looking to latch on somewhere to pick up a ring?