The rapid rise of mobile gaming, particularly on Apple's iOS devices, is stealing "significant" market share from the DS and PSP, which are beginning to "stagnate".
That's according to Courtney Johnson, research and analysis manager at industry research firm Interpret, speaking on the results of a recent US survey.
"Devices which satisfy a variety of entertainment and utility are fast outstripping single-function devices as consumer favorites," said Johnson, based on the responses of 9000 poled.
He acknowledges that gaming as a whole is on a "meteoric rise", while "Sony PSP and Nintendo DS stagnate".
Another recent survey conducted by research firm Neilson concluded that the iPad is the most wanted technology product among US kids aged 6-12.
And earlier this year Epic VP Mark Rein said the smartphones and tablets like iPad and iPhone "are the consoles of the future", seemingly optimistic over the devices' download-only systems and cheaper software price points.
"I'd rather sell 10 million games at $25 and have a chance to sell DLC than 5 million at $50 on a disc that gets traded around," he said.