This is it right here. 2K can make this mode look unbelievably amazing, but if their servers stay true to form - it won't matter - because no one will be able to get on.
That said, the innovation this mode is showing is incredible. I truly wish that 2K brought hockey back because I feel like they would do it correctly. They mastered the NBA game and they've given the WWE franchise some life after THQ ruined it last gen. They're slowly turning that franchise around and while 2K15 was barebones, the gameplay may have been the best yet.
I wish the EA team would do something like this with the NHL series. I would give the franchise a much needed jolt in the arm and could be marketed towards everyone - casuals and diehards and whatever gamer characterization you want to use.
One can dream.