I think a lot of people are making judgements based on their assumptions on how the TV will be used, and tbh, I think that is an influencing factor for the decision many people make.
Several people on this thread have assumed that the tv will be watched at night time. Why does this have to be the case? My DDs have the tv in their room so they can watch movies on a Sunday morning. They cuddle up together and watch a movie. It is very cute, and does no harm.
Lots of people assume that TVs in rooms means that the parent will no longer know what the child is watching. Again, this is not necessarily the case - It will depend on what rules you put in place. We're one of those that have a tv and DVD, but no aerial in that room at all, making it physically impossible for them to watch tv. Therefore, I know more about what my children are watching when they have a DVD in their room, and I know less about what they are watching when they're downstairs watching tv (and I'm not in the same room!)
Again, people have assumed that having a TV will mean that your child will use it for socialising with friends, and will lead to them spending more time away from the family. Again, this is not necessarily the case - it depends on how often they watch the tv.
I really don't think it is as simplistic as saying tvs in room = bad. Too much of the issue will depend on when and how the TV is going to be used. For example, there is a whole world of difference between a child who has a TV in the room, but TV is used only to watch particular programmes (and never as background noise) and then there are children who do not have TVs in their rooms, but have the living room TV on constantly, and watch it endlessly.
The location of the TV is not necessarily the most important factor, that's a bit of a red herring imo, its when, how, and why the TV is used which is much more important to my thinking!