Your logic is flawed.
Those things you felt were so wonderful in Oblivion and Morrowind and are "missing from Skyrim, WERE in the console versions of both MW and Oblivion... therefore the consoles were quite capable of handling the *cough* complexity of both games. I am confused by your statement.
I found Oblivion to be a far worse game than either MW or Skyrim. Terrible voice acting, terrible animations, disgustingly poor AI, nauseatingly repetitive level design, with the exact same cavern, exact same room layout, exact same door placement... time and time and time again. Armours and weapons look ridiculously cartoony, and the Horse animation you seem to have loved? I can't find words for it... it was terrible. Character models were awful... the Argonians looked as though they were stolen from a child's colouring book and the Khajiit looked like attendees at a Thundercats Cosplay convention. The orcs? Like Games Workshop art class rejects. Some of the quests were ridiculous... the Arena questline was terrible... the main questline was incredibly dull.
MW's "depth" was smoke and mirrors. Yes, there were a TON of guilds and houses and quests... but all scattered throughout and incredibly sparsely populated world. One of the main quests asked you to take a MONTH of gametime to go "do something else". Poor combat. A very simple main quest. I loved Morrowind... probably played it for about 300 hours all said and done, but it was deeply flawed in many ways.
*MINOR SPOILERS*
Skyrim. Skyrim has it's issues. I do think that the Thieves Guild questline was a bit lame... at least the "return the guild to glory" quests... very repetitive. The DB however... the quest was good. Nazir gives you some low level jobs, certainly... but none of those were given to him by the nightmother. If you recall... the main quest was given to you by the nightmother. The Nightmother sends you to take care of Astrid. The nightmother transmits the dark ritual to you, that's what she does, that is your job as listener. Someone performs it, she tells you, you go do the job. So yes, you do function as the Listener.
As for oversimplification? What I have found is that I focus more on playing Skyrim and less on constantly checking my stats. In the previous games, certain stats were just constantly climbing numbers... athletics, agility, strength, use a skill, the stat climbs. Eventually topping out. Same goes for skills. use it, it rises. In Skyrim at least, you can tailor your character as you wish... you have to "practice" a skill to get better, so you can buy your perks. Your perks allow you to customize your character as you see fit.
I could go on, but I have to respectfully disagree with your argument that the game has been oversimplified. I find it to be quite the opposite. With this game, Bethesda has come closer to finally realizing their objective of "play YOUR game". They have a ways to go in some respects, but they are far closer with this one than in others.
But, your argument that consoles can't handle the complexity has been proven false, as your two examples were handled quite well by consoles.
Edit to add:
One f the greatest flaws of both MW and Oblvion were summed up in how I created my characters. It made more sense for me to create my characters such that the skills I wished to use were all "minor" skills, and the skills I didn't want to use as much, I made my "Major" skills. The levelling in both games was mind blowingly retarded, and to me, pretty much game destroying.. As was stated by a previous poster, in Skyrim, I use the skills I use, and they get better. The end.