No, I'm not committed to Lightroom. I was trying to determine if purchasing the buy out Lr would forestall having to sign up for the CC subscription plan.
You need to look at the situation from a different perspective.
a. Adobe does not offer a Lightroom Creative Cloud package.
b. What they offer is a Photoshop Creative Cloud "Photographers package". The principal component of this package is Photoshop CC2015 which has Bridge and ACR 9.5 (latest version) Plugin. In addition Lightroom CC 2015.5 is also available with this package "free gratis". This is a no brainer for Adobe since the two major functions, the Library and Develop Modules are just an alternative to Bridge and the ACR Plugin.
c. Adobe also offers Lightroom 6.5 as a paid stand alone application which has the equivalent of ACR 9.5 builtin. However some of the recently added functions like the dehaze function is not activated in the standalone application. All the new camera and lens support are available.
d. Lightroom is a complete application and does not require that you have any other Adobe product installed on your computer for it to function.
So if you do not require the Photoshop Creative Cloud plan you can utilise Lightroom 6.5 as an alternative to Bridge and ACR 9.5 and utilise an earlier version of Photoshop e.g CS 6 (the latest version of ACR available is 9.1.1) or Photoshop Elements 14 as your primary editing software application.
Obviously if you do not subscribe to one of the Creative Cloud packages then the functions that are only offered there will not be available to you.