Honestly, you would know just as much as we would. Those kinds of decisions are kept so close to the chest at the highest levels of the company that it's impossible to project.
Personally, unless there is sudden consolidation or a failure of an airline, I think most Delta hubs are pretty stable. The Detroit metro population has been fairly steady for the past decade or two. It still is a major economic player unlike the post industrial landscape in the other areas of the rust belt. At this point, unlike with the CVG/MEM drawdowns, there really isn't anywhere to put that capacity. I don't think it's economically advantageous to focus all that flying into MSP or vice versa. NYC can't take that traffic and sending a lot of that traffic to ATL is incredibly inefficient and adds significant travel time