You can check out an example static page here: https://vogel76.github.io/static_page_example/
Enter a transaction hash to look up a transaction containing a comment operation. This is obviously a very simple example, but it demonstrates that it's already possible today — as has proven.
Here is the "source code" — though calling it that might be a bit generous 😄
RE: Why Hive sites CANNOT be decentralized? (shocked, LIVE reaction)!