That's what I think too and it may be true for the iPhone.
Many people are working or studying from home though, so some other products may sell more than usual. The new MacBook Air may be successful this quarter, so the iPad. Maybe not the Pro model they just renewed, but the base model or the Air can be great companions during these weeks at home.
I just bought a new Mac for myself, as my wife needs to work from home and is using my old laptop. I can see many families doing the same especially if both parents needs to work remotely. Of course many more will be on low budget and won't be able to afford a new device, at least not an expensive one.
As for the iPhone, I think it going to be a low priority this fall. Many people won't be able to afford it, and others will prioritise other technology gadgets like I said before. I feel lucky as I can work from home and still get paid, that's why I could afford to buy a brand new MacBook Pro, but I don't feel like spending another 1000 this fall for a new iPhone, same for the Watch. I'll update those devices in 2021