Ok the scenario of Big Brother is that 12 or so people live in a house together and try to get on. The problem is that these people are not themselves as in the real world they would go out, go to work e.t.c.
OK I would not like to see a virtual Truman show but what about a room being set aside so the housemates could go to work in it. Maybe start of with a blank room and give them tasks to win supplies for making an office,bar,gym or hairdressers or just a luxury room. The housemates should only be allowed in the room on working hours and would have to clock in and out. The goal being that they would be able to use the toom in the last few weeks.
This would firstly bring a bit of structure to thier day, and would mean everyone would have to work as a team and would probably mean less alcoholic fuelled behaviour as they would have to consider getting up for work and yes thay would get the weekend off so we would see them doing there friday and saturday night stuff.
Only a suggestion sorry it is a bit long.