It is hard to quantify, but having done the remote working thing for a while myself, there is a lot of communication that one misses.
Skype, Facetime, G+ Hangouts etc all help, but there is still a significant qualitative difference to being in the same physical room as a bunch of smart people - both in terms of coming up with better ideas and solutions, and of avoiding miscommunication and misunderstandings.
No doubt as our comms tech gets better that gap will decrease (it's a lot narrower than ten years ago), but it's definitely there.
Skype, Facetime, G+ Hangouts etc all help, but there is still a significant qualitative difference to being in the same physical room as a bunch of smart people - both in terms of coming up with better ideas and solutions, and of avoiding miscommunication and misunderstandings.
No doubt as our comms tech gets better that gap will decrease (it's a lot narrower than ten years ago), but it's definitely there.