It's also a product of aging and getting some perspective. When I was in my 20's I knew everything about every player in the NHL and NFL, I had season tickets to the Stamps, I listened to BJ games on the radio, I read SI, THN, etc. Hell, I even knew what was going on in the NBA, and I hate basketball. Now, I have a life, so the Flames are well down the chart of things I care about, and the other sports have almost passed completely out of consciousness. Soccer (EPL, specifically, because of availability and superior production) is really the only sport I really watch now - when you have a very limited amount of time, you really have to triage, and while I am very interested in the Flames' trades, drafting, rumours, etc, I would much rather watch Chelsea play Watford.
My only truly sustained hockey-watching is the draft - I watch every minute of that.