You can build a website that earns money. Even if it is just a little bit of a profit, it is still a profit. Then you duplicate that effort to build more websites that people want to visit. The subject matter that people are searching for 24 hours per day is practically unlimited. Now you might not make a lot on niche searches, but the stuff that is always being searched for is the way to go. There are different systems and gurus to consult about building a successful website such as Alex Shelton. Choose the system you want based on what it is that you want to accomplish.
None of this is a get-rich-quick thing. You have to put the work in. You cannot just press a button and sit back and earn money. However, you do not have to fully rely on a nine-to-five job either. You know how they can go. There is company downsizing, layoffs, mergers and acquisitions. All of which can affect your employment. Even unstable markets can affect whether you have a job tomorrow or not. I think it is a good idea to have something else to fall back on. At least building profitable websites does not require offices, inventory or even staff.
Some people are ready to jump into this with both feet dedicating the amount of time needed to grow and establish their online websites that are earning them money. You do need to be ready to adapt to emerging markets and build websites to suit them. Even just information websites that have advertising can earn a decent profit if they get enough traffic. Just build sites that have something to do with what a whole lot of people are searching for answers for. There is a learning curve, but there is money to be made online.