Remember when businesses ran on cobbled together access databases and vb? It was easier than building something ny prompting an llm.I made a good living just rewriting those things for them when they fell apart.

For the most part, you can replicate any B2B SaaS product in a spreadsheet. The same reasons why spreadsheets didn't kill B2B SaaS apply to "in house vibe coded SaaS replacements." The original in house apps are (and continue to be) spreadsheets.

> build once, sell the same thing again ad infinitum, and don’t suffer any marginal costs on more sales.

Unless you consider customer acquisition cost. Not considering cost of sales is one of the big mistakes software developer entrepreneurs make.

here's the secret saas can vibe code features too on top of their paid well developed and secured api. they can get off their ass and vibe code a mcp wrapper, so user can use the ai tooling they pay for to interact with their saas. and they'd be called visionary hero of the agentic revolution.

but they don't want to. and they will be replaced, as it's good and well.

Something notable for SaaS which this article doesn't mention is that in some cases the reason to buy rather than make yourself is due to needing to handle a bunch of different regulations which LLMs don't threaten (barring businesses which would rather have lawsuits than pay for a SaaS).

Maybe things will finally go full circle and people/companies will restart self-hosting their infrastructure instead of farming out everything.

The trick is to build stuff that is hard to vibe code

Maybe the new SaaS is to build vibe coding (aka conversation) into whatever you’re offering.

AI isn't killing B2B SaaS. It's killing the service economy. Perhaps, the correct term, technically, is just shrinking it to very very small fraction.

Be a System of Record, not just a Wrapper™ is excellent advice.