With the invention and spreading of the D20 system, the rules get spread even further. D20 is - as far as I know - based on (A)D&D , and therefore the core remainsprobably the same.
If D20 weren't license-free, I would see a tendency towards monopolism.
I really wished there was more diversity.
By the way, many, many German gamers wished there would be more RPGs based on DSA, but FanPro failed in several cases (LMK, Armalion), but nowadays let DSA-based RPGs produced for cellular phones (aka "Handy" in German) which have Java included.
They should take a look at how TSR/Wizards get THEIR system so masively widespread !
