I would think that simple devices are easier to secure. They don't have the same horsepower available for encryption/decryption, but they have far fewer vulnerable spots than a complex system. I doubt that anyone knows how many points and methods of potential entry there are for a typical PC.
A blue tooth device may have only one point of entry and only one protocol to defend. If the 8-bit MCUs don't have enough power to be secure, even at that level, maybe the low-cost 32 bits will be able to make greater inroads by meeting that requirement.
As we unveil EE Times’ 2015 Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. Panelists Dan Armbrust (investment firm Silicon Catalyst), Andrew Kau (venture capital firm Walden International), and Stan Boland (successful serial entrepreneur, former CEO of Neul, Icera) join in the live debate.