[resu_nimda]

It really feels like there should be a well-funded startup attempting to tackle this problem by now.

A central service where you can easily manage many subscriptions, with integrations into other websites. There are a lot things I would pay for if I didn't have to go through the process of creating and managing yet another account. If it was just a one-click add/remove.

News websites come to mind. I would also use a "buy access to this article for 50 cents" feature. It just has to be frictionless.

The major players might not want to give up the money from people buying subscriptions and not using them much or forgetting to cancel them, but that seems like a lunch ready to be eaten.