These are WWE profits from 2005 and 2015 according to Meltzer. That is a stiff drop.
The problem imo is it's not an easy fix. The easiest fix is load up your RAW episodes with all the stars. The problem is you run out of fresh and interesting match ups and make no stars. It's a bandaid and will slowly just get worse.
The other route which is painful is the one their on now imo. You have the problem where your midcard will be featured more. If you don't have strong writing or a strong midcard it won't be good. This to me is the it has to get worse before it gets better. The only way to make these guys stars is television time. No one wants to see a lot of them because their not stars, but the only way to make them stars is give them time. Catch 22.
They're doing the correct thing. Slowly. Smackdown! has been great since the split. It's had solid writing, good segments, enjoyable two hours of television.
RAW still suffers from that 3rd hour. It's too long. It's too much content. And it exposes your roster badly. I know I preached more time for your midcard and this potentially gives you less. I'd bet if they cut that 3rd hour and condensed the show, it would improve greatly in show quality and ratings. Right now they're all about quantity over quality.
Nearly 50% drop in 10 years. Jeeeez.
WWE is really lucky they don't have any real competition.