What's missing is all the people and business partners who are already using skype right now and who have not switched to an alternative and probably don't plan

What's missing is all the people and business partners who are already using skype right now and who have not switched to an alternative and probably don't plan to. Users seem to be very accepting of all sorts of nonsense in software if "everybody else" is still using it and they can contact their loved ones through it. (Just like why is "everyone" using facebook and twitter instead of competitor x and y?) And I am not sure you are in a position to tell a client "sorry, we would rather use GTalk or Jabber!".