We MAY be able to solve, so why not try it? I'd put avoiding death at the top of any list of priorities.
To make money you should be solving a problem (stealing and monopolies being exceptions). Web startups exist to coordinate people, that's the only thing they are capable of - they cannot "physically" do anything else. (the exception is personal data backup such as dropbox).
Also "web startups" as a class don't exist to solve anything other than maybe the question "why don't I have more money".