I bought a 360, and I enjoy it and dont regret buying it. HOWEVER, the main issue with the 360 and the XBox for that matter is original/exclusive content. (Halo & Forza being the only 2 that jump to mind)
I bought a Wii, and I also enjoy it, the main reasons i bought it is the innovation of the control scheme, the pricepoint, and exclusive content, SMART move to release Zelda at the start.
The PS3, the wild card, I DONT have one, Why? Price. Just couldnt justify it at this time with having the other 2 systems. Is it dead? No.
Will it be #1? doubtful, (Wii will, due to pricepoint) PS3 has many exclusive franchises that when they hit the shelves will drive sales (Kingdom Hearts, Jax, Gran Turismo, to name a few). I will probablt pick one up end of the year.
Now I think I am NOT alone, I would bet in this "next Generation", Multiple systems will be the NORM not the exception. With that being said, I would say there are easily enough sales to keep all 3 systems afloat and doing well.
The Winner? The Wii.
Runner Up? 360 Now, but could easily be PS3 by end of '07.
Holiday season '07 will be where the true war is fought, and we should all benefit with price cuts, and great game content for ALL systems.