I think there's very little chance of Bryant being a Cub past next year. He's had nagging injuries in three straight seasons, and he has been bad when he has tried to play through them. Players who start getting hurt a lot in their 20s usually continue to get hurt in their 30s. He just hasn't been healthy enough to justify paying him into his mid-late 30s.
I'd be shocked if they non-tendered him. But I wouldn't be surprised if the front office decides to trade him for underwhelming return because they feel they're better off having his money available to spend somewhere else. Same with Schwarber.