[dirtyaura]

You underestimate Google's own ability to take advantage of new web standards and technologies, and Google's inhouse skills of running huge data centers efficiently. In the pure search tasks, Google is likely going to be really good in the future too.

At one point, the serious future threat for Google was Facebook, because Facebook was a big walled garden, that Google couldn't crawl. If Facebook is the number one web page for a few hundred million people, businesses start to operate inside Facebook more on more, which would make Facebook a good starting point for your searches too, making Google the second choice.

Although other aspects of this scenario have happened, the search part hasn't, and it seems that Facebook has changed the strategy from walled garden to more open place, and try to become a critical infrastructure piece of the whole web with like buttons and instant personalization.