Maybe, but bear in mind anyone who's old enough to remember steam in commercial service is going to be pushing 60 at the minimum nowadays. Steam has proven to have appeal beyond nostalgia, and I doubt the general public would especially care whether or not a newbuild loco was built to a preexisting design or not (as long as it conforms to their expectations of what a steam locomotive "should" look like) - all the media hype on Tornado focused on it being "the first new steam locomotive in fifty years", not its A1 connections.I think a large part of the appeal of steam is the nostalgia; recreating the past.