I enjoy remote work because I want to feel alone – I can't help but think preferences like this alienate some of your employees. Like me, if I worked with you.
I'm not used to the idea that somebody on my team can just start talking and assume the team will hear them. So I don't feel the need for that kind of communication with remote employees.
I've worked remotely for over 8 years at 3 different companies. Two have had some variation of this (Hipchat/Slack + Google Hangout / GoToMeeting or Slack calls) and it works great. We have a daily standup meeting on video and then we can jump on a video call through out the day if we find a need for it.
Otherwise, I have clear focus through out the day - I can choose whether to respond to slack notifications or turn them off and work through them later.