Some really good points there, especially about the Celebrity investors, who would have thought Ashton Kutcher was in the know how about all this stuff?!
For me there's usually a trigger, which I think Instagram was, with some justification as to why this time its different, which for me is Cloud. The Cloud has triggered some early successes from really small teams which is only going to excite investors and founders more to launch even more start-ups which will inevitably lead to more weak ideas and a self inflicted bubble of selling to the greater fool once they realize half the new start-ups aren't going anywhere...