I expressed a deep, personal feeling gained from my own experiences--here. Nothing more. Presently, I am cognizant that it is likely I will experience a greater realisation after leaving PMR; a re-awakening to the greater purpose of this life-time.
But as you have said, or as far as I understand, none of the dimensions within any system are more than VRs. If I understand, each system is an experiment, ongoing. Each dimension within each system is yet another VR. Right?
So, in the end of Robert Monroe's 3rd book, when he discusses his contacts with his higher self (for lack of a better term), he relates that he had one more life-time in this PMR planned; and then his higher self was going to move onto another reality. Within your constructs, where was Monroe referring to, another system, another dimension within Our System?
Also, if memory serves, his higher self told him that it, or they, had high expectations for him, and that he was seen as a likely personality for accomplishing specific goals, so that they could move onto the next reality. In what way was he being counted on? Was it his awakening? Was his extensive OBE learning experiences a part of the accomplishments they were counting on?
And, have you been in contact with Monroe since he left this PMR?