The only way I see Google being "superseded" is if they cling to their business model to the extent that it jeopardizes their products. Web advertising, in its

The only way I see Google being "superseded" is if they cling to their business model to the extent that it jeopardizes their products. Web advertising, in its current form anyway, already looks like a sinking ship. Unlike IBM and Microsoft, Google inherently has much less user lock-in, so it'll be interesting to see what they do if their cash cow begins to seriously dry up.