What does any of this have to do with expanding mdw? This would decrease MDW traffic and passenger loads, which is not what needs to happen. I'm sure if other routes were viable from other airports they would have tried them already. MDW is the most convenient point to connect Midwest traffic for them. It's southwests busiest airport. Why would you disconnect cities from it? Or circumvent it and prevent connections to other destinations. I'm not saying CVG wont get more destinations eventually but they have a lot more going for them if they can offer 1 stop connections from mdw to 60 other destinations.
One of the big differences between CVG and the surrounding airports is that Southwest has not yet served any destination other than MDW or BWI nonstop from CVG, even though WN will be operating seasonal nonstop service between CVG and PHX from March 8th through April 7th. In addition to that, ICT, DSM, and MKE, which are all located in the Midwest, do have nonstop service to STL on WN but do not have any nonstop service to MDW on any airline. MKE is too close to MDW for Southwest to even consider serving MKE nonstop from MDW, but ICT and DSM were both served nonstop from MDW on WN prior to Southwest discontinuing MDW-ICT and MDW-DSM nonstop service almost 2 years ago.
All 9 of the airports served by WN other than CVG that are within a 300 mile radius of CVG (MDW, CLE, CMH, DTW, GRR, IND, SDF, BNA, and PIT) also have nonstop service to at least DEN and MCO on WN, and WN can already connect passengers from MDW, CLE, CMH, DTW, GRR, IND, SDF, BNA, and PIT to destinations west of the Rocky Mountains through DEN.
I agree with your point with respect to Midwestern destinations other than CVG, and I agree that WN will continue to serve CVG, CLE, CMH, DTW, GRR, IND, SDF, BNA, and PIT nonstop from MDW. Additionally, all of the WN destinations west of the Mississippi that are served nonstop from MDW on WN also have nonstop service to either STL or LAS on WN, and in addition to that, CLE, CMH, DTW, IND, BNA, and PIT all already do have nonstop service to both STL and LAS on WN. WN can already connect passengers to destinations further west from CLE, CMH, DTW, IND, BNA, and PIT through STL and LAS.
I also agree that WN will continue to use MDW to connect passengers from SEA, PDX, and MSP to destinations east of MDW, and I also agree that WN will continue to use MDW to connect passengers to destinations west of MDW from IND, SDF, GRR, DTW, CVG, CLE, CMH, and destinations further east.