This has been the case for some time now, but the ecosystem of large-ish companies was diverse enough as to avoid appearing dominated by this or that player. The fall of Novell and Nokia, coupled with Ubuntu's various pivots and IBM's troubles, left Red Hat as the lone real force with the capability to steer the most significant projects.
This is nobody's fault, but it's not healthy in the long run.
> It may well be that the pace have now gotten to the point where hobbyists have a hard time keeping up, as they have things they need to do besides stare at code all day.
Totally agree. The needs of modern computing (server-, desktop- and security-wise) have drastically increased IMHO. You need to read so much documentation and existing code before you can even start coding. That's just not feasible in your free time after work if you're having an active social life or another computer-unrelated hobby.
Although I have to admit I might be biased about this topic. I'm contributing to a FOSS project which got a lot of flak for trying to raise money for employees in a ... well, more aggressive way. While not necessarily agreeing with everything that happened, I do believe you need to work full-time on modern FOSS projects to push ahead.
May well be the case.
Somewhere GregKH mentioned how the pace of kernel development had changed, with git being a major part of it.
It may well be that the pace have now gotten to the point where hobbyists have a hard time keeping up, as they have things they need to do besides stare at code all day.