Can't really argue with the Straw Man. This still seems like a very extreme corner case. I'm skeptical that your 'well designer character' requires you to use the exact same build as the OP. Also, you still have to sacrifice hundreds of points in Armor to keep yourself from getting one-shot by a decent Frost Mage.
But I'll bite, and discuss rebalancing a bit.
I doubt they will completely remove certain enchants from the game. They did implement a soft cap using diminishing returns, but I guess they could nerf the power of enchants using a patch?
What is the highest damage a player could expect to receive in a single blow? I'm seeing Ancient Dragon Bites at about 300 damage. So assuming Morrowind-style damage reductions calcs, it takes 1500 armor to reduce that to 50 points of damage? 2500 points of armor reduces it to 32 points. What would you consider is the lowest a player should be allowed to reduce an incoming 300 point attack? Or would you prefer to rebalance weapon damage too, so it became an even trade of blow vs blow? Ancient Dragon has 3100 hp, we max out at 800, so if we traded blows only, we'd both die at the same time? What would you call balance here, assuming we can't retcon the enchantment tree?
I don't think you understand what a straw man argument is, and I already gave my suggestions for rebalancing. It's not about just nerfing it, it's about getting rid of a broken mechanic. Though I suppose they could even leave the skill boost, but cap enchants, potions, and armor improvements at what you'd get with
just 100 of that skill, potion or enchant stacking should make them any better. Skill improving pots and enchants would still have some benefit, but only for skills players don't already have 100 in.
The character the OP is using is, I'm afraid, clearly the optimal character. It is the best archer, the best thief - it gets the highest sneak attacks at least -, and it could even be adjusted to be the best mage. Basically, the ideal character for any role should have max smithing, enchanting, and alchemy just to give them the best possible defense if not offense. In a game like Skyrim, it's disappointing that there is such an obvious optimal build.