It's almost inevitable. The day will come when most new homes have a metal roof. People will look back on the "old days" and wonder why asphalt was ever a consideration. Sure there will be those who say that asphalt was less expensive, but the phrase "to install" will be quickly added. Because asphalt is only less expensive for the short term.
Then the discussion will turn to design, durability, warranty, colors, weather protection, and environmental friendliness. People will shake their heads and again wonder why asphalt was used. Of course it made sense at the time, but that time is past.
Yes, the day will come.