I for one would like to see original seating enforced by FA's although I accept that it is often difficult. My regular route is ORD-LHR and I have seen people move from C to F and from E- to E+. As ststed on previous threads this seems unfair given use of SWU's miles, purchased upgrades let alone revenue passengers. I hope that the reintroduction of some curtains may make some difference but I doubt it. %The only thing that will make a difference is FA intervention to the extent that passangers acknowledge that moving up a cabin is not acceptable. I would definately like to see this applied to E+ particularly given UA's E+ advertising campaign.