"...as a designer/developer, code my game such that multiple versions..."
Testing compatibility with mods you did not code yourself adds to your own development time. Also, not only do you have to keep your own game modded with everyone else's updates and test every time someone else updates their mod, you have to take responsibility for other's mods you distribute with your own. Someone else's mod breaks and it's your fault.
The only practical solution to distributing multiple mods with one update is if the mod devs want to combine all their mods into one distribution that one person or team tests and uploads to the Web as one offering, removing all the single distributions of the mods. Similar to what Superpack did with Falcon4.
If you were a developer yourself, you would conceive of many more complications than those I pointed out here.
-Pv-
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