Fischer certainly showed himself to be the dominant player of his time (clearly better than Korchnoi or any other Soviet player of the '60), and he is a strong contender for all time greatest, but you lost me when you said "and always will be" - sounds like a religious viewpoint.
Who knows that there might not be someone in the future head and sholders above Fischer, Kasparov, Capa, Alekhine, Lasker or anyone else who ever played the game.
Bobby Fischer vs Korchnoi
who do you think is stronger?
or have anybody had any more other Top GM player
i feel that Bobby Fischer is the best and always will be!!!