Well that's a start, but in what way can these things not be done through skills directly, or through the use of some perks? Why have a bunch of redundant mechanisms that basically do the same thing as each other? And while some of those suggestions make sense, other aren't all that logical. With your Willpower idea for instance, it would be more logical to presume that if my overall magical abilities increase, I'd have a better understanding of how to defend myself against magical attacks.
A feature is only as redundant as Bethasda wants to make it. In Skyrim (or at least how it is according to the interviews) you can have 100 skill in one handed, picked all the perks in the skill but you would still be as worthless with a 2hander as any level 1 character. Attributes are a more broad way of defining a character compared to skills, just like skills are to perks. This however does not make skills redundant. They simply are more overarching than perks, and while perks could just as well become the only way of defining a character by dropping the replacer attributes and skills. I do not think it will make for a better game.
As for the willpower part, I took that as an example because it was simular to how it worked in the other ES games. Besides, having high willpower is (or should be) viewed as a part of your ability with magic.
We'd still end up with a scenario where you end up maxing out almost all of your attributes and ending up with just some generic character like the last one you played.
Then give attribute increase a hard cap like perks, or a soft one like the replacer attributes. It's not like having attributes always will result in maxing them all. This was just how Oblvion and Morrwind worked.
And that won't happen since there will no doubt be racial perks to make them different.
Racial perks will not be able to cover for the cutting of attributes. Either because racial perks will be given to you at the start of the game, causing every Nord to be as strong and smart for example, witch is just as wierd. If racial perks were picked trough the course of the game, in what skill would they be? So far, there have been no statements on perking races or general perks as far as I know.
While, with clever use of atributes, each race could have bonuses that last throughout the game. Simply by giving each race an certain percent of increase in a certain attribute. Orcs could gain a +10% in strength for example. While Altmer gain a +10% Intelligence.