18,500,000 developers in a world of 7,170,000,000 people. This means 0.258% of the population can develop. Billions of people using websites, applications, etc every single day.
We are in the “golden era” of developers right now. I foresee the next 5-10 years being the most pivotal in a lot of our careers. I also foresee a huge shift in interest over the next few decades, with more and more young people taking an interest in software development. Especially as languages and tools evolve, making it easier and easier.