I don't know if you've looked into it, but there is still going to be a fair few teams that are going to be in pretty difficult circumstances this off-season. Tampa, the Islanders, Vancouver, Washington, Chicago, Dallas, Vegas, Pittsburgh and Toronto are all going to be in some Cap-distress, while Edmonton, St. Louis and Philly will be pretty close. Seattle is going to be a magic wand for everyone of those teams so there will be plenty of room for Detroit to take on a bad contract.
But what I don't buy especially is the sentiment that our rebuild timeline was altered by a lack of moves. This team is going to remain non-competitive until multiple young players emerge for us as elite talents at the NHL level. Free Agency or Trades are simply not the way contenders are built in the NHL. So until a few of our prospects exceed their draft projection, or we pick a stud prospect, the best we can do is try to accumulate talent on our roster that is either cheap, short-term, or both. If we get really lucky, maybe some team gives up too much for Mantha or Bert, and that might move the needle for us a few years down the road, but that is both a big if and would take awhile for it to happen.
To reiterate: we are going to be bad until 2023 at least, and we still might only be mediocre by then if we are unlucky.