I always find this kind of question difficult because LabVIEW is just my preferred language. If an employer said we are switching to something else, I'd just shrug my shoulders, load up the new IDE and ask for the project budget number to book to.
I think the issue at present isn't really if there is demand for the next 10 years. It's what Emerson will do at the end of this year. You could find that LabVIEW and Test Stand is discontinued this year, let alone in 10.