Putting aside the question of whether it is fair or unfair to do that with Sanjay (I would lean toward it being a slightly jerkish move, unless it had been discussed between them previously)- I think getting rid of Sanjay for 1 year of Berry (based on my entirely incomplete knowledge of his talent) would not be the best move. I think from a leadership perspective you lose something, but more importantly you lose him playing a defense + rebounding role that others on the team do not have. There's a reason Sanjay played 24 mpg last year, and even with Vic back and everyone else hopefully healthy I don't think that will go away.
In terms of defense, Vic is very athletic obviously, but I don't think he bring the same defensive tenacity that Sanjay does to the table. On multiple occasions, Sanjay significantly took a star wing player out of their game, and he would still earn meaningful playing time next year against teams that orient their offense around such a single player of that mold. I don't think we beat Wisconsin without Sanjay shadowing Hayes in basically a box and 1, and that final shot by Illinois very well might turn out differently without Sanjay shutting it down (not to mention his defense the rest of the game). Most recently the BTT game against Michigan- if they don't switch BMac onto Irvin with the dribble screens, I think he has a much harder time making it with Sanjay on him than BMac. I could go on - though Denzel Valentine stands out as one counter-example of a wing player that was so hot when we played MSU that even Sanjay wasn't able to stop.
Not having a guard/ wing that can create and make his own shot in 1 on 1 situations late that develop in close games has hurt us frequently in the past - yet we underappreciate the value of a lockdown defender who can stop other teams in those situations and disrupt the plays the other coach will call.
And worth mentioning briefly- he led our team in rebounds last year (slightly behind Olah on a per game basis but very close). And his eFG from some quick numbers I think was 56%, which I believe was behind only Skelly, Pardon, and Taphorn. So while he wasn't a plus offensive player, he made enough open shots that he wasn't a liability offensively in the sense that teams can't just abandon him / he doesn't ruin our floor spacing.