since google keeps doing R&D to improve the search as per the latest trends chances are slims atleast in the short term
I dont think FB and Google both will fall soon. Because new generation come they will loving it. And those two also keep themselves up2date with new era. If there will not some popular alternative come they will always keep their position.
Myspace will keep falling the site is slow and offers no value to anyone. Google and Facebook and twitter are here to stay a while
They have so much money and pretty loyal visitors right now, and they know what they are doing so I doubt it. Also I don't use Myspace or anything, but I've wondered why I only hear people talking about FB and never ever mention Myspace anymore, while as far as I know it was first and is very similar to FB (Also very popular before/still?). But I guess that's off-topic to this.
I know I will live to see the fall of facebook like Myspace. As for Google I think Bing is really taking over any competition. Bing offers alot more and exact searches based on website content. The plane main page of Google needs to change because its just getting old. I need youtube searches and tweets searches against all my main website searches in the future.
google will fail although not this time. it will probably take years and years when the better one will rise.
Neither Google nor Facebook is going to take a fall anytime in the near future. Both companies are way to strong and have enough money to continually shove out for R&D and marketing to ensure they stay in success. If either of those companies were to go under, it would be only from another MAJOR company in the same field offering better services which is highly unlikely.
Sure... the giant Google will fall someday, not long enough from these days.... almost all the contents which indexed by Google are sucks and getting worse in every day by day! It's has been difficulty to finding good quality content nowadays, thanks Google for not being rapidly evolve. By the way... I'm just kidding.... Google is ROCK!!!