I'm pretty sure you would agree that you have a good bike there. A different bike may spice things up for you. But, in my experience, once you have a good bike, set up the way you like it, it becomes more about what you do with it. Have you been touring here or abroad? Have you tackled all kinds of different roads and routes on it? Have you done any track days? Been on a camping trip, explored everywhere you can go, taken it up a drag strip, set yourself a challenge, eg, longest ride in a day, charity rides, group ride outs etc etc? For me, these are the things that keep me riding, it's just about keeping it varied/interesting - who's to say, maybe you'll go to all the trouble of selling, get the latest whatever, then that will just sit in the garage?
And besides all this, winter is coming so it'll be a buyers market. Why not have a break from riding through the winter and then see if you get the itch to get out on it again next spring? If not, you'll likely get more for it as a new summer approaches than now.