My experience with Dallas was a lot different. Growing up in Texas and Oklahoma, very few of us were born in the same town and lived there our whole lives. I knew almost no one born and raised in Dallas, nor in Tulsa for that matter. Living near St. Louis today, the areas couldn’t be more different. St. Louis has its transplants, too, but it seems almost everybody is a local. People often don’t leave the neighborhoods where they grew up, and where you went to high school defines your whole life. I love Dallas, and it’s a much friendlier and, despite the rush, is a lot more laid back than St. Louis in a lot of ways. However, it’s very chain centric and nationally branded. My parents dragged me along to Campesi's many a Friday or Saturday night in the early 80’s. So, I know there are local places if you know where to look, but the chains are the first businesses I notice every time I go back.
People are moving in constantly. Turning on KVIL for alternative will always be weird to me, but a large portion of the population today wasn’t there when KVIL was a powerhouse AC. They don’t remember when KVIL mowed down every competitor. KVIL was also the main factor that forced Evergreen out of the market in 1992 when it voided the company’s pending purchase of KRLD two years earlier by snatching the Cowboys. The 18-34 group that KVIL targets has no memory of that time. The early 90’s are closer to Neil Armstrong’s moon landing than they are to today. I suspect, however, that you are right that the music mix is probably the big reason Alt 103.7 can’t hold its audience today. A good number of people still regularly sample the station, though that number would appear to be going down, too. They just don’t seem to be sticking around.