I certainly agree that product lifespans are getting shorter, but despite the very common belief that everyone can build products overnight, I still think building a good product is very, very hard.
The reason is that most people try to skip the fundamentals and create a demo overnight, assuming people will want it. We had more than 200 conversations with customers to truly understand what they were looking for, and we had to evolve our offering significantly along the way.
I don't think building a good product overnight is realistic. AI gives you the ability to build much faster, but it's far from free, considering the cost of tokens. I agree that it's much cheaper, though. What it doesn't give you is the knowledge that comes from understanding your customers and going deeper into a problem they actually want to solve.
I also agree with you that distribution and marketing will be key. One thing to remember is that you should start with marketing and distribution, not with the product. If you spend all your time building the product first, it can be very hard to sell it later, and you may not have enough time to find your audience, especially if you're bootstrapped.
I'd recommend focusing on marketing first, building second, and getting real-time feedback from your target audience throughout the process. Talk to your customers every single day and keep learning from them. That's something AI cannot do for you on its own.