The link Mannimagnus posted seems promising.
1. Yes, CS needs game data and would be useless without it. I'm well aware of this. Therefore mod creation would still be a pleasure exclusive to PC users (unless a limited version of CS with game data is released for the purpose of modding for consoles, but with that comes possibly more ability to hack), but could be enjoyed by both PC and console users alike. There isn't anything really inhibiting mods from being used on consoles, aside from the formality of getting Sony/MS to go along with it, according to the UESPWiki blurb. There's apparently a market for it. Exclusive console users are accustomed to only having what they are given (DLC), so not having the ability to create mods directly won't pose a huge problem. Having a PC that can mod it (if you were really beat on modding for your console) is only an added bonus. And, in that case, these people should probably just get the PC version.
2. My PC runs Oblivion, but needs modding to run smoother since my hardware is all integrated (Streamline, low-poly meshes, etc. etc.), however the CS runs and I can mod with no problems. I suppose it's an issue that varies by machine, but it's not that big of a problem. UDK won't boot on my machine due to shader issues (needs 3.0), so perhaps the issue might be something like that that you're referring to? I'm sure the Skyrim CS wouldn't run on my particular rig, but that doesn't mean it's the case for everyone else.
3. It is the same for PC users, no? And people with Android phones? (The market is not as heavily regulated as the Idevices') Corrupted files are always a possibility when you begin loading outside content onto any machine, but it's still done and is still popular. Loading time is known to be increased on PCs with heavy modding (and is made worse on a low-end machine) but that doesn't stop anyone. Hasn't stopped me. It's prerogative above all else. Because of the fixed specs of consoles, some mods would make no sense to have available (hi-rez textures, retextures, poly-increase/decrease-ers, etc.) but mods that add content would be fine. Perhaps content needs to be confined to stock game data, but it'd only be a partial trade off. It's amazing what can be done with vanilla data. Save game corruption comes down mostly to responsible gaming and modding, I think, but it could pose a problem for console users who are unacquainted with the way things work.
I can understand your points, echo, but I feel like most of the problems you are presenting are either negligible or already accounted for.