I tend to agree with you, but you never know. Companies get complacent. I wouldn't try a frontal attack now, but in ten years Google might be very bureaucratic.

Also, it wouldn't be a new way of finding data that would make Google obsolete, but a new way of advertising. That's where their money comes from. They could be the best service in the world for finding information, but if for some reason advertisers preferred to reach people some other way, it wouldn't matter anymore how good Google was at search. They'd be reduced to a money-losing public service, like newspapers are now.