If fundamentally unscaling signed linked list is worth to lift up here, there are perhaps plenty of other things to be mentioned as new.
Just the fact that a blockchain doesn't scale in an obviously good way is probably part of what confused people into not inventing it sooner. Surely if total storage requirement increases without bound, it can't possibly run forever! Well, humanity won't run forever either. It just has to last long enough to be useful while it exists.