I don't get your point.
Instead of having two well balanced shows, you want to fit it all onto one show whilst destroying the general structure of it. Why do all of this when you can have two detailed shows instead of one less entertaining one?
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Your question is nonsense!
Did they have a brand extension during the "Attitude Era"? No. Did everyone get a run every week? Mostly. I'm sure, over the course I saw Kaientai, the Nation Of Domination and other jobbers get some screen time. Raw was better then, because they build up stories properly.
There is a saying: "More is less". The structure of the show wasn't thrown out before 1999 (when Smackdown debuted). In 1998, when Raw was rating the highest, they had "Raw" and "Sunday Night Heat". So my suggestion is to go back to that (having "Superstars", or, if you please "Smackdown", being like "Sunday Night Heat").
Most superstars could fit onto "Raw" back then, and I don't think they had many more top guys then , then they do now. I don't see why we need to keep the charade of a useless brand extension going, just so some jobbers, who are clogging up the WWE list, shouldn't, in your opinion, be "future-endeavoured" , which is more fitting for some of them.
I care more about promoting the top talent, while building new "top" guys, then giving jobbers something to do.