Bergeron is a lock to be in. He's better than anyone on the 3rd line and scratches at least. 4th liners, debatable as well. If he doesn't participate, it will be his decision. Otherwise, he is in and will play.
Now, get Doughty off this team, he shouldn't even make Canada's B team.

He could get hurt and it’s about making a team that fits. I could see him being on that defensive fourth line tho. As well look at the description for the logic

they’re going to bring back the marchand-crosby-bergeron line. it’s happening. i also think pelech might make the team over one of the LHD, since none of them are strong defensively.

"He could get hurt" So does every single player...

"it’s about making a team that fits" Marchand-Crosby-Bergeron is likely the best fit you could find on any team at the Olympics. They've played together in the past, were dominant and all three are still elite players. MacKinnon will probably play with McDavid, here's your fit.

I agree with you that the combination you suggested is very possible but that’s not what I think is going to happen.

Doughty is awful

I think Bergeron could fit on the fourth line but he isn’t as offensive as Mackinnon to put him on the second line

Over the past three seasons (at 5v5), when Bergeron is on the ice,
-Bruins score more
-Bruins shoot more
-Bruins attempt more shots

than both MacKinnon and Point with their respective teams.
(Bruins also allow less shot attempts, less shots on goals and less goals)
With Marchand and Crosby, everything will be fine.
Production-wise, Bergeron has played at 1.02 pts/GP pace over the past three seasons.

63-87-37, MacKinnon with McDavid and Point on the 3rd line is the most likely scenario.