Good luck trying to find a new Superman then. It took WB how many years to find a suitable actor to play the Man of Steel?
Not that long actually. Superman Returns
was made in fairly short order once Singer signed on. So Routh was found in a pretty quick talent search. Previous projects, that ended up being canceled, had been more oriented towards signing an established star. It's a fallacy that it would necessarily require a very long, difficult search to find a new actor to play Superman. As long as the producers and director, whoever they may be, had their heads screwed on straight (as opposed to thinking that Nicolas Cage would be a good Superman) then there's no reason why a suitable new actor couldn't be found in good order.