One advantage you'd get by going with the GX7 is access to all of the micro four thirds lenses. When you buy an ILC, you're really buying into a camera system not just a camera. MFT has good choices for macro, wide angle and even a high quality fisheye. There are several mid-range zooms of varying quality too. If you feel like you only plan to use one lens, you may be happier with a camera like the RX100. The key with an ILC is being able to use the best lens for a certain scene or type of photography. In exchange for that specialization, you give up being able to do multiple things so-so.
Buying a discontinued camera is a tradeoff. On the one hand, you should be able to get a better deal on the body and the housing since the products are being discontinued. In fact, if you're not getting a deal on it, you're losing one of the few upsides to getting a discontinued model. On the downside, you're getting something that's already a couple years more obsolete. In 3 years, how will you feel about having a 5 year old model vs. a 3 year old model? It depends on your personality and how you feel about having the latest and greatest.