People on this list generally seem pretty generous in spirit and sharing of their knowledge, insights and opinions. It seemed a pretty reasonable and typical question to ask. I guess if there's no answer to be had, then so be it!
You asked the question in a manner where the obvious reactions are: Reply Affirmative: "Yes, I am planning/working on that right now" or Do Nothing: "I'm not going to respond because while I'm not aware of any work in this area I have no clue what others might or might not be planning/doing in this area before the heat death of the universe (a reasonably close approximation of "ever")".
Since most things are theoretically possible a flat out - "no that will never happen is unlikely".
Thanks David J. So I guess I could have asked:
Is there any reason there is no RLS / MV support now?
Are there any reason fundamental reasons why PG couldn't support RLS for MVs?
Is it just a matter of nobody has done it yet?
Is there other development work that would need to happen before this could be implemented?
In the scheme of things, is it a lot of work or not so much?
Has there been any discussion of implementing this feature, and if so is there a link to it?