Well actually besides not having a team of players yet, the other problem will be snow and super coldness of NYC in the winter. Most MLS teams head to Arizona, South Carolina or Florida for preseason tournaments starting in later Jan thru the end of Feb. Thats most likely the first time there will be friendly, preseason games.
That would not be an issue as I had always assumed any friendlies would not be played in NYC, anyway. The teams on winter breaks would want to go to a warm weather climate.
Kreis has said a few times that the team won't be assembled until January.
I think that is just conservative press talk. And even if ultimately true, nothing says a friendly could not be arranged toward the end of January.
Again, for several reasons, it would be very, very risky to make the first match (where the quality, tactics, and fitness of the team are tested) our first in the league. All of ours eggs in one basket and that sort of thing (intrasquad matches are not sufficient).
I'll stop arguing the point, though, as I seem to be in the minority.