It's like you haven't noticed he is trying to break data out of the web jail. MVC is an in-process architecture. Evidently, he's thinking about an inter-process architecture that could be fronted in multiple ways.

There is nothing "in-process" about MVC. I can access ActiveRecord objects just as easily from an IRB as from a Rails action, and I can drive a REST API just fine from curl. He's simply crazy.

Your inter-process service broker is called "MySQL".

This may not be the best architecture.

MVC isn't part of "the art of Unix". But probably neither are "service brokers", so I don't know what ESR is thinking here.

SQL isn't part of "the art of Unix", but I'm pretty sure this has more to do with ESR simply not knowing what he's talking about.