It's nice to have a long term horizon of a hundred years of mining, and it's true that web-mining can achieve a higher decentralization than any other method. However, at the moment there is still one fundamental element which is totally centralized, and this is your website, where the people can mine. Should your server disappear, so would the network. And obviously your server cannot plan to be online for the next 100 years. How are you planning to solve this critical issue?