It's important to tell the whole story here. Gavin stepped back as lead maintainer and appointed Wladimir. No one else.
Maintainership is the sole reason to have commit acccess. All changes to the software are made as pull requests. And commit access is only needed to merge these pull requests. Nobody commits directly on master without going through a pull request, not even maintainers.
Being the maintainer of an open source project is hard work and can be quite thankless at times. The role is one of a glorified janitor while still requiring the highest both technical and people skills.
It is not surprising people only do this for a few years, and as far as I can tell Gavin did a great job. I don't think that is in dispute. But he should not have commit access when he is no longer maintaining the software.
(It may also be of interest that Gavin stepped back from maintaining the software in order to focus on his role as "chief scientist" for something called the "Bitcoin Foundation". This foundation was comprised of a number of noteworthy people whose names keeps appearing and re-appearing in MLM schemes, "hacked" exchanges, and/or premined coins. Gavin may be the sole exception.)