LIterally, yes. Now, in result? Maybe maybe not. But we've had two terrible games this year and we can't pretend that in both games Glennon didn't tank the game.
Mediocre gets you no where, but you can go 4-12 and lose games like Week 1 vs. the Falcons and pull a random win out of the hat like the Steelers and feel good about the season. What's not going to feel good as a fan is when Glennon looks like an utter ******** moron in "primetime" (loosely) against the Packers on the road, or what happened in the Buccaneers game.
I mean recap what happened in those games? Glennon had I think 3 or 4 turnovers in the first half of each. I mean he literally lost the game immediately. If Trubisky could even run the offense like you're suggesting and be no better at all, if he can make better reads to avoid the INT numbers of Glennon it's worth it as a fan. And as the #2 pick with the starter sitting at 5 INTs and 6.0 YPA thru 4 games? And it's more than the INTs. (Let's not even mention Glennon messing up the snap count and literally punting the ball into the linebackers in the second drive of yesterdays game). Glennon has been getting strip sacked a ton.
Shoutout to the dude above who mentioned it first, but that's what Trubisky adds to the team that they do not have right now: Mobility in the pocket. Specifically the ability to extend the play. I've watched Mike Glennon play for four games now. The dude is just TERRIBLE and sensing pressure, and even if he could sense it he does not move, and he does not move quick. He is a freaking statue. It's the clear reason for having so many fumbles, he's not sensing the guy who's about to hit him. Trubisky on the other hand even the preseason they worked on moving the pocket, and he's mobile enough to move out of the pocket and extend the plays.
Extending the plays is far more likely to cause there to be any semblance of a passing game. Play action/moving pocket would be far more dangerous with a Trubisky lead offense. Kendall Wright and Markus Wheaton may not be very talented, but they're more likely to succeed playing playground football. Wheaton at the least should be used to that style with BB. And listen, they're not great, but Wheaton can run deep routes, and Kendall can run underneath routes, and at this point I just don't think Glennon's going to take shots and I think the defense knows it. He's playing like Brock. I think Trubs is more likely to try it.
Also just the fact that Trubisky could move the pocket and move to the outside could help to spread the defense as well. Again. I'm not saying he's like Deshaun Watson even, but Trubisky is just incredibly more mobile than Glennon, who is a literal statue. It'll make the O-Line look better, it should give the WRs more time, it has a chance to spread the defense with a "mobile" QB, and literally nothing should be worse, because Glennon isn't doing ANYTHING difficult. And if he can furthermore limit the turnovers from what Trubisky is doing right now and hold the ball a bit longer, it's going to make the defense play better. Because the defense has played REALLY well this year. They've just gotten worn down with short fields and low TOP from the offense so having to play a lot of plays.