WN has issues. They're losing passengers now that bags aren't free. Now it costs more than the big 3 in a lot of cases. Also the new WN has said will be going away from point to point and doing more hub and spoke style. Basically Im not sure what WN will be in a year or two
AA had to pull back due to pilot scope. They had demand, but not demand for mainline.
DL needs something in TX, so i see AUS becoming that. Right now flying DL from TX to anywhere in Midwest/Central US is basically a non option, has have to fly to MSP/ATL/DTW 1st.