Can someone explain why people thought that Playstation All-Stars would sell millions of copies?

[CCFanboy]

richardhutnik said:Another thing i saw about it is that, at its core, it is a 16bit fighting game, that was new at the time, and the gameplay is "timeless" or "dated" depending on one's view.  I would say any sales of Super Smash Bros. successors come from an established fan based married to the Nintendo console.  While a mash up brawl is a cool idea, I am just perplexed why people think that, off the Nintendo platforms, anything Smash Bros. like would end up doing gangbusters.  And also why anyone think Sony would actually lead into it.  

What is behind the hype actually?  Would an Uncharted clone by Nintendo suddenly sell millions on a Nintendo platform?

An uncharted clone would be very unlikely to sell much on nintendo either. An ico clone would do much better. Lets be honest, sony copied it because they saw the sales of smash bros and thought it was easy money. It is possible smash bros popularity also comes from it having characters from games like mario, zelda, pokemon etc. But I think it is more to do with the concept.

Sony changed things to make it different but the concept was done.