[rob_b]

This disadvantage will be one of the largest hurdles to overcome, dependent of course on the amount of participants and their corresponding access. Once more mainstream adoption occurs then this could be reevaluated and become a non-issue but how far away is that?.

[sriku]

This hurdle is not very different from people needing to have individual mobile phones to communicate with each other. Such a distributed requirement where the device is reusable across multiple contexts and not limited to a company may result in the costbeing directly borne by individuals. It might take time, but we've seen this repeatedly happen - the internet, cell phones, wifi, cameras (ever snap whiteboard pics?)