Because I don't give a **** about October hockey... or NBA preseason basketball... or an expose about a deaf shot-putter from Lithuania, whose perseverance and gumption should be a lesson to us all. I don't want to have to tune into an hour worth of that crap plus commerical breaks, to be able to see NFL highlights, if I don't have to. And thankfully, due to media like Twitter and YouTube, people don't have to, which is why highlights shows like Sportscenter are dying relics of a bygone era.
I think a lot of people also forget how slanted ESPN was choosing which teams to highlight. UCONN wouldn't be half the brand it became without the constant exposure from ESPN just down the street. And not just college. How many times did the Lakers or Celtics game get highlighted when other games were much better. Don't get me wrong, I watched SportsCenter just like everyone else, but I'm not sad it's no longer relevant.