Fairly accurate in my experience.

Also a note about a specific bias from old-heads:

At the start things move much faster and changes are more impactful, but the start is ultimately much shorter than the rest of the lifecycle. That's why a lot of the stories you read about tech are about the early years (let's say 5-10 years, chronologically) and less so about the mature years (which can span 3+ decades, chronologically). So the early period has outsized visibility because it's cooler, I guess?

* * *

Using SCMs as an example:

SSCS - 1972. But at that point there was no internet and the number of computer users was minuscule. So SCCS is just a curiousity, a footnote, probably used by 0.000001% of Git users. So at this point for most practitioners SCMs basically don't exist.

RCS - 1982. See SCCS. SCMs still practically don't exist for most practitioners.

CVS - 1986. Now the internet is getting started and the number of computers in the world has increased by orders of magnitude. Even so, adoption of core development technologies like SCMs is slow and yes, it took CVS at least 10 years to become somewhat established. Even at this point, probably at least 50% of software developers still don't use SCMs (especially less professional ones). Visual Source Safe runs in parallel to CVS, with its own problems described in the article.

SVN - 2000. The internet is in full swing, computers are ubiquitous, things are really moving. It's super hard to evaluate how many developers still don't use SCMs, but the number is going down (maybe 30-40%?) and SVN is taking the world by storm. Even after the launch of Git in 2005, until at least 2009-2010, SVN had a solid shot at winning. It's tooling was much better, especially the GUIs, TortoiseSVN & co.

Git - 2005. Git is launched in roughly the same era as SVN, just towards the end. Once Github gets going it starts to take over the SCM scape, primarily from SVN, sometimes from CVS, Perforce, and also from non-SCM people.

So, if you look at the real dates implied above: CVS, SVN, Git are widely adopted in about a 10-12 year span (something like 1998-2000 to 2008-2010). Then we reach the current mature (monoculture?) stage where we're already at least 16 years in and it's quite likely this phase will last decades.

This story has happened for lots of tech. Many different PC OSes during the 1970-1980s, then basically only 3 since about 30 years - 1995 (Windows, MacOS, Linux).

Many CPU architectures during the 1970-1980s, then basically only 2 since about 30 years (x86, ARM - maaaaybe RISC-V).

From CVS to Git, thirty years of source control