With Tork you have to figure out if he is fixable now. You can take the lessons learned from his struggles and apply them to the next phase of prospects.
When I say fixable, the minimum production given his defensive limitations is a high .700s OPS with at least 30 homers a year. If that isn't possible, then you have to find other options. You can't wait around on a hope and a prayer. The passage of time is not a development plan.