In my experience (having submitted many patches) it is very hard to get patches accepted to fdo projects. It may be because the maintainers are salaried by RedHat, so they get new task assignments and are removed from maintainership of the packages. E.g here is a six year old patch lingering:

https://bugs.freedesktop.org/show_bug.cgi?id=16783

Someone certainly could write a bunch of patches to make the dbus specification better. But to get those patches included into the official dbus specification is a completely different problem. And you know that. Having spent a lot of effort in this thread defending the dbus spec as adequate, you wouldn't be the one spending your time integrating their patches.

You could see the blog post as a bug report. Pointing out weaknesses in the spec that could use improvement. Or you could see it as just another guy ranting on the internet.