A forum about all decentralized dns projects, including namecoin, would be good, and could hit it big if there is ever some surprize news regarding centralized dns. It would probably never happen, but having a site set up awaiting such an unlikely even would be like holding a smart lottery ticket.
Still, it seems the big roadblock is that the cost is denominated in nmc, and the second roadblock is simplicity since the process has to be very simple to ever catch on, and a third roadblock is that social things like web networks need to reach a critical mass of genuine users before most people have any interest.
The third issue is always solved in the crypto community by building fake user bases and incentivizing them with cash. That works well with shitcoins that are designed to disappear once the dev can cash out, but most people spot that kind of fraud.
Projects like Wikipedia, YouTube and Facebook have failed. Simply because anyone can create an account and all the networks become a deep grave of digital garbage. Exabytes of worthless data garbage. Financed by advertising and sold user data. Or in the case of Wikipedia, by $110 million of donations per year. Even though it will forever remain just a hobby writers portal to pass the time. I'm gonna change that and offer valuable community portals where only valuable content is provided by competent members. So I'm not interested in getting millions and billions of users on the platform. Fake users will never create any valuable content, so this is certainly not my concept.