I think the central idea is to preserve the marque. Is using a new body shell "preserving the marque"?? Is installing disc brakes and electronic ignition "preserving the marque"??
Most definitely, I think so.

We can't relegate all LBCs to museums: most of us restore these cars so we can DRIVE them! Making the car drivable involves restoring with safety improvements and other upgrades that make the driving experience more enjoyable. Most of us don't go too far with these mods, in general.
After 30+ years of playing with, driving and restoring these cars, I think the hobby is in a pretty good place. I think the marque is being preserved, in general. Sure, club memberships are slowly declining, but that's inevitable since it's an older group. It's not a crisis, by any means. Thousands of folks flock to the shows.
I went to the three major, regional LBC car shows in my area this year: Washington DC MG Car Club show ("Hunt Country Classic) this weekend with 300+ cars and record attendance; "Classics on the James" in Richmond with 250+ cars; and the Shenandoah Valley club show last weekend with about 150ish cars (someone correct me with these attendance figures if you have them).
The vast majority of cars exhibited in these important shows were restored with significant effort to keep the car generally original. Sure, the paint may be metallic and the interior a non-original color but the antique British cars in these important shows are, for the most part, good examples of the original build. They look a lot like the originals.
Further, the vast majority of LBCs that I encounter have owners who are want to stay at least somewhat loyal to the concept of "original". I see few, if any, LBCs anywhere that are ruined (from an originality point of view). This is a good thing from a purist's standpoint. Again, in general, I think this means that the marques are being preserved.
I don't think our hobby is veering off, down some horrid wormhole toward UN-originality. Folks aren't ruining LBCs in the restoration process.
It's all about preserving the marque, IMHO, and I think we're doing just that all across the country.
Do you guys agree? Aren't we, in general, preserving the marque?