I think you're right in your comparison and that's way we'll soon see mass layoffs of software engineers. Software can now be produced with less people than before but I don't think there's market for more software.
However you measure it, in LOC or in MB or in ops per second, demand for more software always seems insatiable. This trend will likely continue up until software can be produced with zero humans at all. But I can’t see that happening unless we invent actual real artificial intelligence.