I think Detroit is well past its “bottom”. I have visited there every year (briefly) for the past 14yrs and it has some really vibrant and cool aspects now.

My anecdotal evidence is backed up by Detroit Metro real estate outpacing the national average significantly over the past 10 years. The people and culture are great too.

Also if America is ever going to greatly increase manufacturing, Detroit (and the rust belt overall) will be a big player because the navigable waterways have not moved and it is still 10 times cheaper to move things by water than land.