Hell, I've been trying to get coworkers to just get webcams and it is an uphill battle. There is so much non-verbal communication that you lose working remote, it's harder still when you can't even see the person.
A number of teams I work with have fairly strict "Cameras on unless there's some reason you can't (e.g. you're driving)" rules. In general, I think it's a good idea. I know not everyone likes video but it's one of those things you should really do IMO if everyone isn't co-located.
