Ok, 3 types of channels of communication: Private, semi public, and public.
Private would be 1-on-1's convo's and mail exchanges. The new policy will not affect these (or at least not the mail exchanges), even though people can still complain about "they wrote something relevant to my RP that was in a mail I couldn't see".
Semi-public channels (fleet channels, player locations/events/channels) are obviously affected by the new policy, but it appears that CCP at this moment has no idea exactly how.
Personally, I see no reason why CCP actors can't go into these, as long as they are also present in the IGS so everyone can chat with them.
For one, EVE "rules" dictate that actions have consequences, so if your char has made itself the enemy of the host of a party where Shakor is going to be, and you want to be there but the host won't let you...too bad.
It also would not be realistic if members from the Caldari and Gallente militia's were allowed to visit eachother's intel channels during events, or that the goons would have the right to be present in a discussion concerning how to bypass the Goon gatecamp with the Ishukone freighters on the way to Caldari Prime.
In these semi-public channels things will likely be said that is relevant to someone's RP but that they can't see because they're on the wrong side.
Personally, if I was CCP, I would address any complaints in these situations with a polite "We appreciate your interest in EVE online's backstory and events, and while we understand you don't like missing out and not being able to see said comments, but we hope that you can understand that in order to create an immersive, enjoyable and somewhat realistic RP experience, it would not have been benificial for the event if everyone could attend, regardless of affiliation."
I actually think most roleplayers will understand these things, and that not many complaints will be made if CCP did let actors visit semi-public channels. In my eyes, the only place where exclusion is an issue is the IGS/Summit, where a single channel is the default place for interfactional actor/player interaction. This channel should ideally be 100% public.
TL;DR: I think everyone should be able to speak to/hear actors on the IGS channel, but they should not have the right to read all their messages in other places.