According to FareMeasure, there are 408 daily passengers from DFW-MKE. YX numbers are probably strong because of the Kimberly Clark between Appleton and Irving.
I really think YX needs service to all 4 of the Large Texas cities because of all businesses HQ there, i think Houston has like 30 Fortune 500 companies HQ there and Dallas/Irving have another 20 or so. Houston, Dallas, Austin and San Antonio are going to be next New York, Boston and Philly in terms of Business.
There are probably quite a few wisconsittes starting to move down to Houston or Dallas because the jobs are just more plentiful compared to Wisconsin