It is a law that cardinals must be ordained, and popes are not bound to their predecessors. There have been laymen-Cardinals, although in these cases they were ordained with tonsure at least to make them a cleric.
I do not know if Francis will actually do what is being floated around out there, but it would be a radical departure from tradition, and a source of grave scandal to say the least.
But, if this does happen, it would not surprise me, as this is the end of the logic of the revolution to push the boundaries as far as they can, while keeping Catholics on board.
Maybe this is why they are allowing these news stories, to test the waters and see if it will be accepted. The Vatican is not squashing the stories, so why do they remain silent?
This is the fruit of having a line of heretical antipopes for 5 decades. People also said that John Paul II would never allow altar girls as it is strictly forbidden, but they were proven wrong.