Nice Post.
Actually this is something I would like to see in the future. With 4E not having ranks, I think we are moving away from the d20 roll for skills, and I support that. It would save a lot of trouble.
I just dislike the d20 sometimes, as it is such a huge range. +4 str and +0 strength is just not a huge amount of difference when rolling a d20
And it should be.
I would not mind some random rolling, like +2, +1 +0 -1 rank to keep it simple
Actually when you look at 3.5 rules it is a simple look at appropriate tables why the +4 bonus of strength matters:
Strength check to break open
Simple wooden door 13
Small chest 17
Good wooden door 18
Treasure chest 23
Strong wooden door 23
A character with 16 strength can smash down a simple wooden door by taking 10. A character with less strength can´t... but can make it open in some more tries...
A character with 16 strength can smash down a strong wooden door by taking 20 and a character with less strength than that has no chance at all.
So with a list that assumes taking 10 and taking 20 almost al the time, a +1 bonus from an attribute and maybe good circumstances (giving a +2 bonus) may be all that matters...
you could easily read it as a rank system: if you can make a 10 with take 10, you are a novice, if you can make a 15, you are an adept, with 20 you are an expert...
Looking at 3.x with that in mind makes this skill system better than any skill system thereafter...
what broke the skill system down however is the possibility of using all your skillpoints to maximize a few skills. And actually some skills needed to be maxed because the system assumed it (bards and perform, wizards and arcana), usually making some classes skillpoint starved... and making the starting attributes not matter a lot from level 5 on or so...
So a rank system, which makes the bonus from skill training and having a good attribute independent, and makes good roleplaying always matter (the little +2 bonus often didn´t suffice to let you take ten instead of take 20) should be an improvement...
a small improvement over the 3.0 System, but a big improvement over the 4e system, which actually embraces the wrong assumption about how to use the 3.0 system...
(They saw how the system was played, and made that playstyle easier instead of remembering how the system was thought to be used... actually it also took me 5 years to realize...)
So having monte cook back, to explain them what his intentions were when designing the 3.0 system is a great thing for them.