Not really when you consider the overall daytime TV picture.
NBC/ABC's pre noon lineup is controlled by either their news departments, or local affiliates. CBS, however, still has a full daytime lineup, and with 2 shows (TPIR and LMAD) scheduled to start a new season that day.
Thus why CBS at the moment scheduling to end coverage at 9 instead of Noon.
Not everybody has Let's Make A Deal starting at 10:00 Eastern (or the hour preceding TPIR). It's a great reason, one we share, but that wouldn't stop CBS from making a change. Many people whose daytime lineup starts at 11:00 would have a decent CBS lineup running from 12:30 to 4:00 or whenever their half hour local news ends
Despite why CBS would forgo extra/bonus coverage, I agree with
imhomerjay that it would be unusual for one of the 3 big networks to stop coverage early (even if it would be 2-3 hours of reaction from CBS), but you'd think they'd have announce something by now. They're not obligated to I don't think, but people would be unhappy if there's an 11th hour change. To be honest,
I'm not sure if I'll be all that upset since it'll be available at a later time. However, I don't think I'd be a fan if they ran the premiere on the West Coast (in a likely error). Still, for me, it's wait & see (all the way to Monday). It is the premiere, but that aside, it's not a big deal. Especially when you compare it to the celebration of life (for Queen Elizabeth II).
I actually logged on around Midnight to post / with the intent to post the history of season premiere preemptions (specifically 1998-1999) and then didn't since
FanOfDrew87 content that showed up pretty much took care of that. As mentioned, the premiere was pushed back a day, and the scheduled Tuesday show was delayed "then-indefinitely" to air at a later date. It was a New Year's Eve airing, and a perfect show. That was 24 years ago, and the final week of the year is no longer a week full of reruns; if there's a delay, I'm image they'd have to air it (possibly a decent show with very good results) the week after Thanksgiving Week. I figured that Black Friday would've been perfect, but then someone at Discord reminded me that it wouldn't be an option due to college football coverage (in years past they didn't start until around 2 EST, with a Y&R special preceding that).
On the other hand, they could simply push back all 5 shows into 09/26 (next Monday) and go from there. I think we're clear (and everything will run as scheduled), but I will not be surprised if that's subject to change, where we don't find out until Sunday evening or even early Monday morning