Indeed, I probably want to see the same problem solved in different ways. Some sharing is good, but go to far and it becomes homogenization, which isn't one of my hopes.
There wasn't homogenization after the late 2000s. Since then has been a second golden age for RPGs. This is not a subjective opinion either, just looked at what being offered on DriveThruRPG.
What did happen is a D&D related system remained the most popular system with the widest audience. But it doesn't matter what is most popular. We are no longer competing over scarce resources like shelf space, warehouse storage, and the distribution system. If the publisher is smart and handles things well then you get Savage Worlds, Mork Borg, and Fate. If you don't then you get GURPS and Hero System along with dozens of other systems. But even those systems are limping along with new periodic release of new content.
If folks think there is homogenization then they are not looking hard enough. Something I had personal experience with for over 15 years as a OSR publisher (Bat in the Attic Games.
Ah, but RPGs are not software, and don't really need the same level sharing in order to operate well.
In code, when one person finds a way to solve a database injection flaw, it is excellent and essential to share that around to as many as possible. In RPGs, nobody has a data breech because two games solve a problem in different ways.
Not everybody who has something to contribute can write systems. They rather focus on adventures, settings, and other supplemental materials. This is why systems that are open content under open licenses are a benefit. Multiple licenses create friction in trying to support multiple systems as the foundational content needed by an adventure, setting, or supplement may not be available in a given system.
However, with the dominance of a single license like the OGL 1.0a, it is possible to pull together disparate sources to use to cover the gaps and move to one what the author really wants to focus on.
For a great example of this in actions look at Cepheus and its community of creators. Cepheus was welded together by Jason Kemp by using the open content from Mongoose Traveller, Traveller 20, and D20 Modern. Alone each of the three didn't have everything needed to fully suppose a system similar to MgT 1e. Together they did.