Squeezed In Between Less (Larger) People

As I was, the other day, stuck in the subway between two "large" persons, and again today, it occurred to me that the obesity epidemic and the whole growing concern that it raises these days may impact the subway, as much as I think it already impacted airlines, which had to come up with some responses to take into account a larger number of obese persons flying.

True, the New York subway does not have assigned seats, so that is not a problem identical to that of the airline companies, but with more and more large people, the subway cars are getting packed with actually less people in them. Should this be compensated with trains running more often? Longer trains? I wonder if this is something that is currently being brainstormed by the MTA...