Rockband already uses a system like this now that I think of it. They have Rock Band Network songs and then songs made by the RB staff.
Do you have to pay to play online? Do you have to pay for creation kits? Do you have to pay for mods?
I am throwing stones at microsoft because they don't care about anything but money. I remember back when Halo 2 dlc came out. It was expensive but if you waited long enough it was free eventually. Now a days a game can be old and outdated but the DLC is still 1200 microsoft points.
Did you honestly just compare an idea to avoid paying money for DLC to the invention of the telephone?
Bad news: when you got the console version of this game, the only caveat was that you would not get access to mods or the Creation Kit. That's been the same for every ES game. It's not just because of the cross-platform mechanics (which are another serious consideration), but, as pointed out here, it's because of licensing issues that you will not get Microsoft or Sony to relax. PC users are going to pay the same amount for the DLC when it's available.