In my opinion, assembling a game development team before even knowing what kind of game is to be made is not a good thing. "Hey, most game developer teams seem to have artists and programmers, so let's get some and we can work on the story later, because I'm sure it will speed things up". Most serious people will see this as a huge lack of progress and refuse to join. However, if you'd have a solid storyline, maybe even a design document with a bit of content in it, it would help tremendously.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram