He could be, but that means one of Lewis, CC, or Keaschell, and maybe Lee too, are gone. To be a regular less than two years in baseball is not common, but not unheard of. Which of those do you expect him to replace next year as a regular?
It's very hard for a college player to be in their third year in the league at 24...... Especially if they are mid round picks. I think we should celebrate they are getting value from mid to late round picks. Ymmv, of course. I'm just not giving up on guys that haven't even been in the league for a year.
Wallner has hit nearly forty percent better than league average for his career. Lewis is always hurt. I strongly disagree we know that the three young others are failures. It hasn't even been one year. I'm not sure how you feel about Lee..... But he's no failure.
My point isn't so much cut a dude, but don't add more old dudes. Obviously, Keaschell should start every day when healthy.