It either shows how bad the game is - that there isn't enough incentive to even TRY to make it better, or it shows how money-grubbing the EA is, going to such great lengths to make a game nonmoddable, only so they could make more money on content-only updates. If the community is willing, there is little you can do to stop it from hacking into the game's resources. I can't name many instances, but I think GTA, Total Annihilation, Mechwarrior 4, Carmageddon, and Need for Speed (not that I like the latter very much) are good examples of good games being modded without cooperation from the creators.
The problem with Spore is that its problems are deep in the code. Even if modmakers were to start churning out parts of their own, they wouldn't overcome the inherently stupid design of the game - the parts would not matter, no matter what stats they have or how they look. There's no point in the game, simple as that. Even something like Flatspace has a better gameplay hook. Ultimately, you're not doing anything in Spore. It doesn't matter what creatures you make, because they only need like three parts, and it doesn't matter beyond creature stage. The tribal stage hardly matters in the next stage, the city stage hardly matters in the space stage... yes, there's the overall change of direction that carries over, but ultimately you're doing the same thing in every case. That's the problem of Spore, and no mods can fix that unless an Assembly God can take it apart and reshuffle it.