I don't see LY expanding anywhere in the US until/unless they actually get the 787s on property, in numbers greater than to replace the 763s. And assuming they can equip the 78's properly, they might be able to be a bit competitive, but aside from MIA, I don't see anyplace in North America (other than possibly seasonal YUL) they'd really want to be.
It takes quite a bit of traffic to fill a WB... I'm very curious how BOS is doing. I'd expect that most of the tech/bio traffic in the bay is contracting with UA...