I'm sorry OP, and I mean no disrespect but this is stupid. Like really stupid.
1. By sitting a top 10 QB, you're not teaching him a lesson, you're keeping him fresh for the next team.
2. By sitting him, you let every other team know that he's not coming back next year, meaning a team who was interested in paying Dak what he wants, can just wait and not offer any draft capital to get him
3. If we really think Lance is the answer, The time to trade Dak was before the draft. Since We didnt do that, that tells me the cowboys are unsure themselves and Dak knows that. They have no leverage over him, so if we aren't going to extend him, our only option is to play him and hope for the best.