Jansen hasn't been as bad as you guys think, he's hitting the ball harder than last season, balls are on the ground a bit more, K% up more than he'd like, but it's basically really bad luck, Laika posted last week he's top 3 in the league in that context, his BABIP is super low. Not to mention he's near elite behind the plate, he isn't going nowhere.
https://www.fangraphs.com/statss.aspx?playerid=16535&position=C#battedball