I actually don’t believe this is true, at least within the context of Western world. 5 years is a long ways away and the combination of Moore’s Law and the fact that smartphones are also pretty damned good game machines makes me believe they will be market dominate in less than 3 years. From Mobile Tech Today:

Smartphones will overtake regular handsets in terms of sales by 2015, according to a report, “Global Smartphone Market,” published by Telecom Trends International. The report says that sales of smartphones will constitute 2/3rd of total mobile handset sales by 2016.We are witnessing a paradigm shift in the way people use the mobile phone, said Naqi Jaffery, the report author. The smartphone is becoming the primary mobile device, he said.

Smartphones sales will show a robust growth of over 28 percent through 2016 the report said. This is in contrast to regular handsets whose sales will continue to decline, it said.

Smartphones will no longer be confined to a niche market, Mr. Jaffery said. Their falling prices and attractive features are contributing their transformation into a mass market device, he said.

Via Mobile Crunch.