Spike's story doesn't end once you hit the league. I've also read that on here and don't know why people are making that assumption. It's been confirmed you play a select number of games in highschool/college. Then you get drafted. You really think they are going to have 90 minutes of cut scenes to fill only 6 games? Also the dialog from the trailer wouldn't even make sense if the story ended before you made it.
I'm loving everything about this MyCareer. I actually got goosebumps watching that trailer. Next Friday can't come soon enough.