Does that mean the oaks are doomed?
I wouldn't worry yet. Wait and see what the deer do to that area over winter. They may mow all that off if the area is as small as it looks. I'd be more concerned right now with getting a bow stand set up to hunt that.
How I'd address that is this. I'd get in there and find your best oaks and tube them. The biggest reason for the tubes is simply so you can find your trees. Then I'd spend about 90 seconds per tree each year buzzing off that brush low enough with a silky to keep the sun on your oaks. I've been doing the same thing with some oaks on my property. It just happens to be the single half-acre that regens like crazy. The rest of the property, I can't buy any regen.
Here's my area. Right now, you can only see one of my 12 burs in a tube. I haven't done my mow job yet for the year, but they're also ok. Some of this brush is 7-8' tall, but my oaks are up to 6', so it's no emergency yet.