I love Tatum, but he isn't Dirk (at least not yet).
True.
All the same, Tatum showed this year that he can play like a super duper star for stretches:
30.7 pts, 7.9 reb, 3.2 ast on 63.7% TS in February (12 games)
In the playoffs against Philly:
27 pts, 9.8 reb, 2.5 ast, 2.3 blks on 60.7% TS (4 games)
In the playoffs against Toronto:
24.3 pts, 10.3 reb, 5.3 ast, 1.0 stl on 55.3% TS (7 games)
He struggled a bit, arguably, against Miami, but still put up:
26.5 pts, 9.8 reb, 6.3 ast, 1.3 stl, 1.2 blk on 54.7% TS (6 games)
Here is where we put the obligatory "He's only 22 years old!"
He's already very, very, very good. It's reasonable to expect him to improve -- indeed, it would be unreasonable to expect that he won't improve.
In particular I think he has a lot of room to grow as a closer. He showed he could carry the team for stretches this year; the next step is to show that he can take over a game and put an opponent away in the fourth quarter whenever the team needs him to do it, not just sometimes.
Sure and he will get better, but even Dirk wasn't much different that season than his prior runs. They were quite lucky with matchups and what not. It wasn't a fluke, per se, but there is a reason the Mavs never came close after that and only had 1 other Finals and just 1 other WCF appearance in Dirk's entire career. Now I do think Tatum can be a bit more impactful than Dirk because he is a better defender, but he isn't there yet and he won't be next year.
You can certainly disagree, but come next summer you will just be disappointed again if you think Boston has a realistic shot at winning a title.
The C's are +1200 for the title next year behind the Lakers, Clippers, Bucks, Warriors, Nets, and Heat. That seems about right, 4th best odds in the East and 7th best odds overall. They are just ahead of the Raptors, and then you have Nuggets, Mavs, Rockets, and Sixers - all of which you could reasonably see having better seasons than Boston but who probably shouldn't have better title odds (especially the western teams). And you could really only see Boston having a better season than Miami of the teams that currently have better odds (this is of course assuming reasonable health from all teams - injuries change everything).
Unless Tatum takes a massive jump and is in the conversation as a top 5 player, Boston just isn't a realistic contender next year and it shouldn't act like one.
I just don't think a team that has those sort of odds should be thinking it is a title contender, nor acting like one, because it isn't.