Transformable train seats

Frequent train travelers will know that the demand of chairs varies highly on the time of day. Here's a concept that pictures train seats being available to be pulled out of the ceiling of the train. The seating is cleverly designed to be flat when packed up, and to bulge out into the shape of a seat when pulled down. I think this is a good idea, but I do think it will lead to situations where it will be socially unacceptable to pull down a seat for yourself when it's very crowded. Maybe this could be implementable as the cheapest and least comfortable way of travelling, but I'm afraid railway companies will not want to make things any cheaper.