I think it would be a bad idea and out of style for The Elder Scrolls to do something like that, but he makes a good point in saying that it is possible to do and Bethesda has done it in the past. So my question to you is: Would you like having alternate endings in the main quest that would be so diverse that they would require importing saves to future games and have the potential to change the face of Tamerial?
Clearly I'm biased here but I want to here the forum's veiw on this.