I know you want quantifiable data, but I don't have access to it.
However, take someone like me. I always had season tickets so I knew I had an in to the 3-5 games per year I wanted to go to. I dropped them because I know I can now easily go to any games. So, a fan base where fans feel like if they want guaranteed seats to any game, they are better off buying season tickets than finding them elsewhere.
I'm one of said brothers in the pic. That was my freshman year. My junior and senior year's of high school I had season tickets and didn't miss a home game and drove an hour to each one. I went to every game my freshman and sophomore years of college, I went to most, if not all my junior year as well (Oscar's first year). Went to less my senior year. I went to literally ONE game my fifth year and really didn't make much of an effort to watch from home. Barley watched any games this year.