I’m not at all suggesting replacing HTML; it's a treasure we have.
I think you're failing to see the point. Having hypermedia documents follow a file system model does not imply that you would need to basically give up hypertext protocols. I'm sure you’ve at least once visited an Apache directory index on the web. Heck, just type file:///Users/ianburrell in your browser, and you'll have a hypermedia document modeled after the file system. Take that concept to its ultimate conclusion, and you'll see that a dead-simple hypermedia document can be built without resorting to any new technology or infrastructure.
I think you're failing to see the point. Having hypermedia documents follow a file system model does not imply that you would need to basically give up hypertext protocols. I'm sure you’ve at least once visited an Apache directory index on the web. Heck, just type file:///Users/ianburrell in your browser, and you'll have a hypermedia document modeled after the file system. Take that concept to its ultimate conclusion, and you'll see that a dead-simple hypermedia document can be built without resorting to any new technology or infrastructure.