They are not irrelevant, nor they were very popular before, but I agree, they were used much more in the past.
My opinion is that this might have to do with the characteristics and roles of the strikers compared now and before.
Strikers now are more involved in the game play, passing, moving with the ball, so they are generally smaller than before, and a little bit faster now.
Previously strikers were more used as an anchor for the offensive plan, playing a long ball for the striker, which he will try to hold on it until the team and the wingers move to their positions.
Now it is a little different, as strikers are part of the passing more, like Benzema or Suarez.
I like it more now to be honest.
I don’t think so, because 1 goal/game is Messi/Ronaldo/Halaand kind of numbers. But the man’s positioning inside the box is exceptional and his physical abilities makes it hard to guard him, so it is possible but unlikely.
Maybe if he starts scoring penalties, then the chances increase as well.