This is an interest question weather people will still use search engine or your SEO technique still be useful after 5 years. So you got your answer, it will be there to stay. Personally, I strongly believe that it will be stronger as more countries will have facilities to the Internet world also as the younger generation are growing, they are starting to rely a lot on the Internet for entertainment, research, reading, games, music and much more.

But I felt that trend will change towards mobile or phone internet when phone gets better and more powerful.