I don't know that I agree with this.
All of those games offer alternatives to d20M, but I don't any of them replaced it.
I wasn't saying they replaced D20, I was saying they "filled the remaining need for modern D20 system based gaming left over by D20 Modern." IOW, they filled the gaps that WotC could have filled had they actually thrown the kind of support into Modern that they threw into D&D.
There is really no reason why D20 Modern couldn't have had a Spy, Supers, Space Opera and Hard Sci-Fi settings, possibly with some setting-specific rules alterations a la GURPS or HERO. Even the settings that got hardcover setting books- Dark*Matter and Urban Arcana- were woefully undersupported.
Instead, the 3PPs got in there...and got it done pretty well in several cases.
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