The article's main premise is that there is a "vicious circle" which is slowly making renting unaffordable for median income people.
In the article they say "In 2013, the median rent for a new apartment was $1,290, about 50 percent of the median renter’s monthly income
50%!?! That sounds like a lot... but I wonder: What percentage of the median renter's monthly income was rent back in earlier decades? Has it been rising? Has it been falling? The article does not provide that historical data.