Now that you've consolidated the WHC and the WWE Title, I wouldn't consolidate the US and IC belt.
Let the US belt be the low to mid-card belt and let the IC belt rise to the defacto #2. Roster is too big for only two singles champs and the WWE has proven time and time again, if you aren't around a title, they have little for you.
I was thinking that after I posted that WWE with a three hour show, is to big to have just 2 singles titles. And looking at your post, it makes sense on a lot of levels, though I think the WWE would have to do the job of distinguishing the titles to mean that, so people don't think the US is better than the IC. A lot of guys on the roster could do a good US run at the lower tier.
I look at a guy like Kofi Kingston or right now The Miz as a US champion. Their little feud was really stupid and had no meaning behind it, but maybe throw a title picture in there, and has some meaning. Not saying the title should make the feud, but would help the lower guys.
Just quickly going through the roster, guys who are not ready for the IC, but could use a lower tier US run would be like, Barrett, Brodus Clay, all of 3MB (lol), Gabriel, Santino, Tensai, Tyson Kidd, Zach Ryder, and probably a few others, like The Miz who has become irrelevant.
But then you look at that list of wrestlers who are not in the IC title picture and you have to ask yourself, do you really want to see feuds with these guys. Some of them would be ok, but I think it would turn into a joke really quickly.