Thought I'd point out some Delta adjustments.
Next summer, several stations will be all 2 class jets as opposed to a CRJ. These markets are: ALB, BHM, BUF, BTV, CVG, CLE, GRR, GRB, IND, MSN, MHT, and MKE.
All mainline from RJs: GRR, BWI, BOS, CLT, MCI, BNA, PHL, PVD, DCA.
Loss of mainline for RJ's: IND
International: LHR capacity and frequency reduced from 2x daily (333*, 764) to 10x weekly (76W), MUC capacity reduced from 764 to 76W, MEX capacity increased from 319 to 757, CUN increased from 2x weekly (739) to 8x weekly (757, 739), MTY increased from 1x daily E175 to 2x daily E175 and E190*.
Predictions: DL could make some good adds if both sides are aggressive. DL could add 1x daily A319 to GDL (auto & population could benefit from it), Add MAN daily on the 76W, Add domestic markets that specifically target Detroit like ABQ, ELP, SMF, SJC, SNA, BOI, GEG, DAB and MLB. I think that's really it.
I wouldn't get excited about the summer schedule. DL continues to tweak its winter schedule; the general trend is to cut capacity, and the cuts are disproportionately impacting DTW. For example, just a few weeks ago DL was planning to operate a 753, 763 & 333 DTW/SFO the second half of winter, now it's 3x753, with the 332 substituting on select days for a few weeks (for comparison, the flights operated 3x763 this year). During the same period, LAX had been 4x739 & 2x753, but is now listed at 738, 3x739 & 2x757 (operated with a mixture of 4x739/757 and 2x763 this year). The impact on fares is noticeable -- nonstops DTW/LAX booked in less than 14 days generally sold for RT$600-$750, but most flights are now pricing $800-$1000. You'll also have to pay for a "preferred" seat if you don't want to risk sitting in the middle. You can get a lower fare if you connect, but at that point you might as well shop around.
As for your predictions, only SMF, SNA and DAB are realistic -- DL already crashed & burned on the former two, and the latter would be doable Saturdays only for a week weeks at best. NW's vacation arm briefly operated charted flights DTW/DAB (on Champion Air) and NW itself intended on launching service in the mid-2000s, but scrapped plans for whatever reason.