Playstation is a big brand, i remember before the ps3 came out that people were predicting to be the big winner. It doesnt really mean anything. People tend to predict stuff like this based on their own biases.
I dont think any of the three can ever pull off a psone/ps2 type of dominace again. Sony's strength has always been on polishing established designs with hardware and pushing creativity in thei games. Nintendos recent strategies has been to push creativity in their hardware that create new ways to play games. Microsoft is all about establishing communities and branching into multple markets.
They all have their own niches that will appeal to different people.







