(THIS IS ASSUMING DALLAS KEEPS LOSING AND THEY ULTIMATELY DECIDE TO REBUILD)
No, Andrew Bogut won't help us win a championship this year, BUT he does fill a dire need for this team in the rebounding department. Unless a Cousins deal materializes or another all-star player is on the trade market (seems unlikely), getting a rental big seems like the only other trade option to improve the C's at least for this season. Three big reasons the C's should target him:
1. While Bogut is pretty limited in the scoring department, he is averaging around 10-12 rebounds a game this season in about 24 minutes per game. Pair him with Horford and our front court looks extremely solid going into the second half of the season (because a hypothetical trade for Bogut probably wouldn't even happen until January at the earliest). His rebounding alone makes him an improvement over Zeller.
2. He wouldn't affect our cap space after this season, since he is a rental. This is vital as the Celtics could still pursue a max-FA this off season (if there is one they can get) without having to worry much about Bogut's contract (since it's off the books by then).
3. Progression... Progression... Progression... If the C's want to really improve and win more than 48 games this season, they need another big who can rebound, and grab offensive rebounds as well to create more second chance points. Also, it's sad seeing the C's play good defense in possessions LATE in games.. only to see the opposition grab an "easy" offensive rebound for an offensive score. Bogut temporarily solves that problem. Adding Bogut allows the rest of the players on this team "to concentrate on doing their own thing", and we saw how the Warriors were in last season's Finals when Bogut was injured for the rest of the series. Ultimately cost them the series. To win more games and even playoff series, you need that guy who can get rebounds late in games, and that's a huge weakness for Boston right now, even with Horford (he can't do it alone).
So yeah, Bogut would help this team this season, and more improvements and progression by the C's this season could make Boston a much more desirable destination in FA next summer to any free agent (if that's a factor).
Main obstacles I see are: Dallas and Cuban decide to keep Bogut regardless in an effort to make a run and clinch a playoff spot, AND Ainge may want to keep Zeller regardless in case any deals emerge on draft day for an "all-star caliber player", and Zeller's contract may be needed to help facilitate the deal.
But if a deal were to be made, what would you think of: Demetrius Jackson, Tyler Zeller and 2017 Minnesota 2nd rounder and 2017 Cavaliers 2nd rounder for Bogut?