Right. I think this is a huge missed gap that may or more likely may not be filled in the future. A phone USB charger isn't in risk of being a fire hazard, no

Right. I think this is a huge missed gap that may or more likely may not be filled in the future. A phone USB charger isn't in risk of being a fire hazard, nor an eSATA, nor some RAM, nor a wireless card. Passive cooling is plenty as long as not stuck in a cupboard, and being plugged into a wall brings the benefits of heat transfer to the wall. I agree that most implementations have got me cautious as well. But it shouldn't be so. I feel the concept has been eclipsed on several fronts and it'll take quite an effort to become mainstream.