The problem I have with Rampage is that it's taped - first and foremost. Maybe it's unfair of me, but I think we can all agree live wrestling/sports is just so much better in the moment than going back to watch it later. You then couple that with the fact that - outside of that second Rampage (Punk's debut which also happened to be live) the crowd isn't into it as much as they are with Rampage. Then, we can boomerang around to the fact that an 18-45 demographic is probably busy on Friday nights whether it's partying with friends, dates, ect. HOWEVER, I think that due to the "omg CM Punk is returning!" is what gave them such a strong rating there. That's the anomaly right now.
Let's be honest, Rampage is nothing more than a glorified Sunday Night Heat as it stands right now. You look at the cards and you can pick out who's winning every match probably pretty close to every time. Sure you'll get your IC vs. ATT type matches like tonight, but Punk vs. Daniel Garcia or Punk vs. Matt Sydal. I mean c'mon, we all know who's winning those.
I'd really be tempted to almost just throw Rampage on at 7 or even head to head for the first hour of SD at 8 at this rate, assuming they have to stay on Friday nights. I heard TK talking about how they aren't running Full Gear on a Sunday to prevent him from going head to head with the NFL which makes sense since they are both his businesses. By process of elimination, that takes away Sunday, Monday, and Thursday from any potential AEW shows if I had to guess. That leaves you Tuesday, Wednesday, Friday and Saturday. I doubt they'd want to have Rampage air a week later so Tuesday would probably be off the table leaving only Friday and Saturday.
Personally, I always thought it would be cool if they could get BTE on national TV. It's not everyone's cup of tea, but I love the interactions and just zaniness that takes place and think that could really appeal to the non wrestling fans out there.