Adobe's strategy is to move all of their products to a subscription model, that much is patently obvious, so IMHO it's just a matter of time. Hence, if you don't like to subscribe to software, you know that you have stay away from Adobe's products. I don't think it's useful to buy Lightroom 5/6 just to find out that Lightroom 7 is subscription-only and you're boxed in.
Personally, I'll wait for Apple's Photo app. Given the Pixelmator guys' proclivity for cutting edge API, I expect that they bundle part of Pixelmator as an extension which loads within the Photos app. Depending on your needs, that may or may not be enough.
My only real issue is RAW conversion. I'm going to look at Iridient, since I have a X-Trans cameras.