this is very easy to disprove, empirically from what we see since decades: We have open-source alternatives to most SaaS that you can self-host with a single Docker container. They are basically free and far easier than vibe-coding. Yet, many people still choose SaaS - why is that? Because ownership comes with responsibility and maintenance, both are expensive, economically and physiologically (stress).
Vibe coding costs even more than open source (tokens cost money, prompting costs time, stress costs), and also sometimes more than SaaS, because suddenly you own the bugs and the uptime.
Real fun when it breaks on a Sunday and you have to spin up some prompts to fix it instead of paying 12$ per month to a company that handles everything properly.
I think people use vibe coded currently because it's new and exciting, but eventually see the real costs it has and instead will go with the peace of mind option for a few dollars.
Software is dead
It's now the era of personal software and everyone just builds what they need whenever they need it I think