I don’t think it will be the default for enterprise, but it will be for consumer apps. I built a personal finance net worth/cash flow tracker in 3 days, and my circle of friends and family are all on it now. It’s the golden era of building something specific for you and your family.
It's important in this discussion to distinguish between people who make a living from what they create and those who don't. Of course, people can create amazing things with AI in short time but I took "solo founder" to be the solo founder of a company that earns money or manages to obtain good funding.