Do I appreciate it's contribution? Yes
Do I think it should be Grade II listed still? No
I'm sorry, I just can't get on board with it being that historical in comparison to something like Blackpool Tower say. The ride has been changed and rebuilt, and over the years replaced probably 2-3 times over, how does that put it on the same pedestal as the other Grade II listed structures in Blackpool like The Winter Gardens or The Grand Theatre, these haven't been rebuilt many times over the years.
Give the ride a place of historic interest but it's not worth listing in my view, if it was the worlds first to do everything you mentioned then I could see your point, but it wasn't, it was just the first in the UK. Do you think they'll argue for PMBO to be listed as it was the first coaster to exceed 200ft, or Oblivion, Air, The Smiler etc because they all did something unique and world's first at their time.
The effect of replacing timbers in the ride is vastly overstated. I highly doubt the structure has been renewed twice over the years, it just doesn't happen regularly enough.
It's also true of any coaster of that age so I don't know why Dipper is so frequently singled out for this reason.
In my view, it's also largely irrelevant. Any of the great medieval cathedrals will have had their limestone exterior continuously replaced over the centuries to the point where there's little left that's original. The golden gate bridge has been entirely replaced over the course of its life.
The point is that the structure has been there continuously for 94 years. Of course it's seen extensive repairs, it's made of wood!
If Historic England used your critera, hardly anything would be listed.
Blackpool Tower? It's an Eiffel Tower rip-off. Loads of those around the world, wasn't even first. Nothing particularly special about that.
Winter Gardens - the opera house was rebuilt twice in 1910 and 1939. The exterior has also changed dramatically as it's been extensively modified. It looks nothing like the original design. Therefore it shouldn't be Grade 2 listed.
The Grand Theatre? Absolutely loads of ornate Victorian theatres like that in this country alone, never mind the world. Knock it down and build a bowling alley. I find those more fun.
If you look into what most Grade 2 listed buildings and structures are, they tend to be fairly innocuous things like parish halls, old milestones or even lamp stands. I did a search for listed structures in my small market town. I got back 512 results!
On this basis, given the rarity of the structure and its cultural significance, Big Dipper more than qualifies.
If any of the coasters you mention do survive as long as Big Dipper has, I'd say they'd have a very good chance of being listed. Particularly the Big One which is already somewhat of an icon for the town.
You know that happened with words like Castle and Pyramid right?
I honestly have no idea what you're getting at here.