Is Lightroom standalone application being discontinued?
I only use Lightroom standalone NOT CC and I use PSE. I have no need for full PS and no need to edit photos with a smartphone or tablet. Although, I do admit it would be nice to be able to occasionally download a photo to my phone to share. But most times I can anticipate that and export to Dropbox or OneDrive.
This is a user forum so no one can know. Anyone that does know can't and won't say. Adobe, some time ago, went on record that their plans were to continue LR as a standalone program. That statements has not been confirmed recently, but it has not been denied either.
If you have a version you like, keep using it.
Lightroom standalone application being discontinued?
Well, as of now there's no information about it.