Personally I have been for bringing back Spell Creation this whole time...But, this is the first time I have read someonelay out a well thought out counter, and that should be recognized. Cheers.
That said I can see what your saying, and it makes a lot of sense. Yet, there is a lot of stuff missing that could have made UP for the magic system that was left out.
New casting options were added, there is a better focus on strategy for mages... it's an interesting deviation from the norm.
That said, we have still lost a LOT... that could have been made up for the loss of spell creation, yet wasn't included.
I really think that Magic mods will quickly overpopulate modding sites, because there is so many directions we could have been provided yet weren't. Before I continue on that though, I don't think Bethesda put anything to gather poorly. Everything they put into Skyrim was thought out and for the most part appreciated. And, often, the more is better (Which is integral to the arguement for Magic creation) isn't always true.
The issue here is that for a game that is so devoted to making an immersive working world... the removal of something like this, seems counter to their goals. It's not like, no one makes spells, you get spells from that Cat in the College of Winterhold, and he says: "Oh try out these spells I have made." Why can't he do it, but we can't?
Also, going back to the: Well there are new types of spells you can cast, liek Runes and whatnot... yes, that is true, but 64 is a pathetic number of spells, when spaced out over as many schools of magic as it is, and your only left with a couple of chocies at level of how you can do something. Destruction levels as follows: Flame-thrower, projectile flame ball, projectile explosive flame ball, flame cloak. Then there are alternatives for Frost and Lightning. This is rather standard, but thats it. For a SCHOOL OF MAGIC, that seems rather... limited. What about some sort of destruction magic that uses streams of air to slice stuff up? What about pure energy of some flavor that disintegrates? What about elemental combinations like a wall of air that shoves you back, intensifying inner heat to make you combust, draw out all the water from your body to dessicate you? All of these things could have varying strengths from: A mild annoyance, to life threatening. What about pure magical energy instead of just elemental?
There is variety, but there isn't choice. if there were many more options for spells or effects of spells, I for one would forget about Spell making, like I did Attribute points.
Here is something else, even if you didn't have mad variety: Why not have more combinations of magic? If I cast a flamethrower and palpatine fingers at the same time... Well then people are effected by ligthning and fire. Thats boring. What about if I cast a summoned boulder at someone, and use a fireball at the same time? Two seperate spells again, wow again boring.
now, what if I were to combine fire with boulder and throw a fireball weight of 75lbs at someone's chest? That is awesome.
yes, I know I am saying: "What if we added stuff from the game Magicka into Skyrim" but why the hell not? Why the heck didn't we at least take SOME directions from that game's system? if we're going to loose spell making and variety of effects, why can't we have combination effects or counters... or SOMETHING like that?
The point I'm trying to get to here, is that even with the new system... there is SO MUCH MORE they could have made out of it, but didn't. They could have made it freaking amazing, but instead it is... Good, but still a shadow of what it could be. I would rather magic creation copy and pasted with no alteration out of Oblivion (Which was inferior to most other systems IMO) than what they have now!
I won't go into all your specifics and stuff, since you're asking for a lot of stuff that's never even been hinted at in an Elder Scrolls game (not that it's a bad thing, by the way!), so how realistic it'd be to get it is up in the air...
But I will say that I agree with you that the current system has loads of untapped potential.
I am not against Spellmaking DLC, and magic expansion DLC, as long as that's a -feature- of the DLC, and not the basis of the DLC (I.E.: they have stated they are going more Fallout 3 style with the DLC, which is essentially full expansions. If we get full expansions, with expanded magic and Spellmaking as part of that, I think it's fine), but again, I don't think we'll ever get Spellmaking as we've known it in the past.
I'll be curious to see what these modders do with Spellmaking. My opinion on mods is that I typically don't use them, even when I do have the game on PC (I originally bought Morrowind and Oblivion on PC, before it blew up and I replaced my computer with an X-Box 360), because my view is just because a modder makes it doesn't mean it's going to be good. And they often times create way more compatibility issues than they are worth.
I think they took magic in a good direction in Skyrim... they just didn't go the full way with it. They didn't maximize the mechanics they have in place.