I think your pretty spot on. The SESH is a really cool guitar, but it's not the same as a full Hollowbody. There are lots of options from Epiphone and Ibanez in the SE price range so it makes sense for them to compete with that.
I've also been waiting for an SE line of piezo equipped. It would probably put the price on par with an S2, so it may be a tough sell. They could always make a limited batch and see how it goes.
A core baritone would be cool, but I don't know if I'd spend that kind of money on one. I have a really love, slightly hate thing with baritones. I love the sounds you can get, but being 5"5' with T-Rex arms ultimately makes the longer neck just a pain in my wrist.
I would love an S2 Hollowbody Baritone. With piezo! I would have to have one.