I'm always teasing my DH about making our bedroom my sewing room but he just ignores me. LOL
But I see no reason why you can't (or shouldn't) do that -- in your own house. We don't use our living room anymore either and I tease DH that if I could afford an long-arm, it would go in there. But I would probably put it in my family room and move the sofa back into the living room.
Enjoy all your space to enlarge your sewing space. I've taken over 2 bedrooms (so far).