Most of us guys on here 'grew up' with Chris Reeve as Superman & I suspect that's probably how most of us came to to it in the first place, others came to Superman via the Comics. I think that gives you a slightly different take on the character.
Chris is SO hard to replace, Routh did the best job he could, Ultimately it was the script & direction that let the film down. He was, (not his fault), little more than a superman manequin in the movie.
Chris Reeves performance was so nuanced you still notice new things about it each time you watch the movies again, he really believed in that character & took ownership of it during his tenure.
The strap line for the movie was 'you'll believe a man can fly' & you did, but not just because of the effects work, watch how Chris moves, it's his physical performance that 'sells' the whole flying thing. And all they had back then were wires, blue screen & model shots. The most succesful flying shots by far are Chris's wire work. He looks like he is is control, rather than being controlled.
His belief in the character, his charisma & gravity are going to be so hard to find again.
That's why I think it's time for a change.
Like I mentioned most of us now have a broader view of the character, the gen public, tend to accept what's presented them as they don't invest in these things as much as your avarage 'fan boy' does.
In the same way that Batman has gone from the lightly comic/camp (but done like it was Shakespeare) approach that Adam West had, to the angst ridden, brooding dark Nolan approach, I think that Superman needs to have more depth & reality to it too.
They need a Director, Writer & Actor who can get people engaged and take them to a point where they can take this 'World' seriously.
Let's face it when it comes to Superman's world some of the characters especially the Villains are even harder to take seriously than those in say Spidermans or Batmans.
Spidermans Villains are usually 'technological freaks' reflections of the way he was created, similarly Batman's enemies are reflections of his own 'disorered psychology'.
Superman is essentially a 'Humble God' a 'Moral icon', he is an 'alien' but embodies more 'Humanity' than the race he has appointed himself protector of.
He is at his best when he faces the dark reflections of himself too, Luthor, an amoral genius, Zod, a despotic alien, Doomsday, an alien war machine, etc. But some of the other villains that exist in this universe are not as consistent.
Despite this Superman is still truly the greatest of all the Comic heroes that exist.
One thing is sure, to truly make a New Superman movie is possibly going to be the hardest thing a creative team could do. I have always loved this character and would love to see a new series of films that can rival anything that's out there.
I do not envy them this job.